Oxides for new-generation electronics

Ferromagnetic metallic Sr-rich Ln1/2 A1/2 CoO3 cobaltites with spontaneous spin rotation

Título : Ferromagnetic metallic Sr-rich Ln1/2 A1/2 CoO3 cobaltites with spontaneous spin rotation
Autores: Jessica Padilla-Pantoja, Arnau Romaguera, Xiaodong Zhang, Javier Herrero-Martín, Francois Fauth, Javier Blasco, and José Luis García-Muñoz,*
Citation and DOI:

Phys. Rev. B 104, 054411 – Published 9 August 2021
DOI: https://doi.org/10.1103/PhysRevB.104.054411

PlumX: Ferromagnetic metallic Sr-rich Ln1/2 A1/2 CoO 3 cobaltites with spontaneous spin rotation
The Pr0.50Sr0.50CoO3 perovskite exhibits unique magnetostructural properties among the rest of ferromagnetic (FM)/metallic Ln0.50Sr0.50CoO3 compounds. The sudden orthorhombic-tetragonal (Imma → I4/mcm) structural transition produces an unusual magnetic behavior vs temperature and external magnetic fields. The symmetry change is responsible for a spontaneous spin rotation in this metallic oxide.
  • Hits: 169

Bulk photovoltaic effect in hexagonal LuMnO3 single crystals

Título : Bulk photovoltaic effect in hexagonal LuMnO3 single crystals
Autores: Yunwei Sheng, Ignasi Fina, Marin Gospodinov, Aaron M. Schankler, Andrew M. Rappe, and Josep Fontcuberta.
Citation and DOI:

Phys. Rev. B 104, 184116
DOI: 10.1103/PhysRevB.104.184116

PlumX: Bulk photovoltaic effect in hexagonal LuMnO3 single crystals
When illuminating a non-centrosymmetric material with light of energy higher than the bandgap, a net current appears because the electrons do not see the same electronic environment in one direction and the opposite direction, thus they hold a net momentum. This is the bulk photovoltaic effect (BPE), which depends on the light polarization.

Oxides

  • Hits: 342

Efficient spin pumping into metallic SrVO3 epitaxial films

Título : Efficient spin pumping into metallic SrVO3 epitaxial films
Autores: Francesc Macià, Mathieu Mirjolet, Josep Fontcuberta
Citation and DOI: Journal of Magnetism and Magnetic Materials 546, 15 March 2022, 168871
DOI: 10.1016/j.jmmm.2021.168871
PlumX: Efficient spin pumping into metallic SrVO3 epitaxial films
Spin-charge conversion requires materials with a large spin-orbit coupling, which is typically obtained in heavy metal (Pt, etc.) ions. Here we demonstrate spin pumping across interfaces between metallic SrVO3, where V is a 3d1 ion, epitaxial thin films and ferromagnetic Ni80Fe20.

Oxides

  • Hits: 299

Direct and Converse Flexoelectricity in Two-Dimensional Materials

Título : Direct and Converse Flexoelectricity in Two-Dimensional Materials
Autores: Matteo Springolo, Miquel Royo, and Massimiliano Stengel
Citation and DOI: Physical Review Letters, Vol. 127, Iss. 21 — 19 November 2021
DOI: https://doi.org/10.1103/PhysRevLett.127.216801
PlumX: Direct and Converse Flexoelectricity in Two-Dimensional Materials
Building on recent developments in electronic-structure methods, we define and calculate the flexoelectric response of two-dimensional (2D) materials fully from first principles. In particular, we show that the open-circuit voltage response to a flexural deformation is a fundamental linear-response property of the crystal that can be calculated within the primitive unit cell of the flat configuration.

Oxides

  • Hits: 343

Determination of the Crystal Structures in the A-Site-Ordered YBaMn2O6 Perovskite

Título : Determination of the Crystal Structures in the A-Site-Ordered YBaMn2O6 Perovskite
Autores: Javier Blasco*, Gloria Subías, José Luis García-Muñoz, François Fauth, and Joaquín García
Citation and DOI:
J. Phys. Chem. C 2021, 125, 35, 19467–19480
Publication Date:August 30, 2021
DOI: https://doi.org/10.1021/acs.jpcc.1c04697
PlumX: Determination of the Crystal Structures in the A-Site-Ordered YBaMn2O6 Perovskite
We present a complete structural study of the successive phase transitions observed in the YBaMn2O6 compound with the layered ordering of cations on the perovskite A-site. We have combined synchrotron radiation X-ray powder diffraction and symmetry-adapted mode analysis to describe the distorted structures as pseudosymmetric with respect to the parent tetragonal structure.

Oxides

  • Hits: 335

High-Temperature Synthesis and Dielectric Properties of LaTaON2

Título : High-Temperature Synthesis and Dielectric Properties of LaTaON2
Autores: Augustin Castets, Ignasi Fina, Jhonatan R. Guarín, Judith Oró-Solé, Carlos Frontera, Clemens Ritter, Josep Fontcuberta*, and Amparo Fuertes*
Citation and DOI:
Inorg. Chem. 2021, 60, 21, 16484–16491
Publication Date:October 8, 2021
DOI: 10.1021/acs.inorgchem.1c02325
PlumX: High-Temperature Synthesis and Dielectric Properties of LaTaON2
The development of new synthetic methodologies of perovskite oxynitrides is challenging but necessary for the search of new compounds and the investigation of new properties. Here, we report a new method of preparation of the perovskite LaTaON2 that has been investigated as a pigment and photocatalyst for water splitting.

Oxides

  • Hits: 363

Exact Long-Range Dielectric Screening and Interatomic Force Constants in Quasi-Two-Dimensional Crystals

Título : Exact Long-Range Dielectric Screening and Interatomic Force Constants in Quasi-Two-Dimensional Crystals
Autores: Miquel Royo and Massimiliano Stengel
Citation and DOI:

Phys. Rev. X 11, 041027 – Published 8 November 2021
DOI: https://doi.org/10.1103/PhysRevX.11.041027

PlumX: Exact Long-Range Dielectric Screening and Interatomic Force Constants in Quasi-Two-Dimensional Crystals

Electrons in insulating crystals polarize in response to an externally applied electric field, resulting in a partial suppression of the field amplitude; such a phenomenon is known as “dielectric screening.” While much effort has gone into developing a quantitative understanding of this behavior and its impact on materials properties, 2D crystals remain challenging to describe by means of established modeling strategies.

Oxides

  • Hits: 360

Strong strain gradients and phase coexistence at the metal-insulator transition in VO2 epitaxial films

Título : Strong strain gradients and phase coexistence at the metal-insulator transition in VO2 epitaxial films
Autores: Laura Rodríguez, Felip Sandiumenge, Carles Frontera, José Manuel Caicedo, Jessica Padilla, Gustau Catalán, José Santiso
Citation and DOI: Acta Materialia, Volume 220, 2021, 117336, ISSN 1359-6454,
DOI: https://doi.org/10.1016/j.actamat.2021.117336
PlumX: Strong strain gradients and phase coexistence at the metal-insulator transition in VO2 epitaxial films
The proximity of a thermodynamic triple point and the formation of transient metastable phases may result in complex phase and microstructural trajectories across the metal-insulator transition in strained VO2 films. A detailed analysis using in-situ synchrotron X-ray diffraction unveils subtle fingerprints of this complexity in the structure of epitaxial films. During phase transition the low-temperature monoclinic M1 phase is constrained along the {111}R planes by the coexisting high-temperature R phase domains, which remain epitaxially clamped to the substrate.

Oxides

  • Hits: 284

Positive Effect of Parasitic Monoclinic Phase of Hf0.5Zr0.5O2 on Ferroelectric Endurance

Título : Positive Effect of Parasitic Monoclinic Phase of Hf0.5Zr0.5O2 on Ferroelectric Endurance
Autores: Tingfeng Song, Saúl Estandía, Huan Tan, Nico Dix, Jaume Gàzquez, Ignasi Fina, Florencio Sánchez,
Citation and DOI: Adv. Electron. Mater. 2021, 2100420. 
DOI: https://doi.org/10.1002/aelm.202100420
PlumX: Positive Effect of Parasitic Monoclinic Phase of Hf0.5Zr0.5O2 on Ferroelectric Endurance
Endurance of ferroelectric HfO2 needs to be enhanced for its use in commercial memories. This work investigates fatigue in epitaxial Hf0.5Zr0.5O2 (HZO) instead of polycrystalline samples. Using different substrates, the relative amount of orthorhombic (ferroelectric) and monoclinic (paraelectric) phases is controlled. Epitaxial HZO films almost free of parasitic monoclinic phase suffer severe fatigue. In contrast, fatigue is mitigated in films with a greater amount of paraelectric phase.

Oxides

  • Hits: 381

Determination of the Crystal Structures in the A-Site-Ordered YBaMn2O6 Perovskite

Título : Determination of the Crystal Structures in the A-Site-Ordered YBaMn2O6 Perovskite
Autores: Javier Blasco*, Gloria Subías, José Luis García-Muñoz, François Fauth, and Joaquín García
Citation and DOI:
J. Phys. Chem. C 2021, 125, 35, 19467–19480
Publication Date:August 30, 2021
DOI: https://doi.org/10.1021/acs.jpcc.1c04697
PlumX: Determination of the Crystal Structures in the A-Site-Ordered YBaMn2O6 Perovskite
We present a complete structural study of the successive phase transitions observed in the YBaMn2O6 compound with the layered ordering of cations on the perovskite A-site. We have combined synchrotron radiation X-ray powder diffraction and symmetry-adapted mode analysis to describe the distorted structures as pseudosymmetric with respect to the parent tetragonal structure. The YBaMn2O6 compound shows three consecutive phase transitions on cooling from 603 K down to 100 K. It undergoes a first-order structural transition at T1 ≈ 512 K from a C2/m cell with a single Mn site to a P21/c cell with two nonequivalent Mn sites.

Oxides

  • Hits: 330

Orbital occupancy and hybridization in strained SrV O 3 epitaxial films

Título : Orbital occupancy and hybridization in strained SrVO3 epitaxial films
Autores: Mathieu Mirjolet,*, Hari Babu Vasili, Adrian Valadkhani, José Santiso, Vladislav Borisov, Pierluigi Gargiani, Manuel Valvidares, Roser Valentí, and Josep Fontcuberta
Citation and DOI:

Phys. Rev. Materials 5, 095002 – Published 9 September 2021
DOI: https://doi.org/10.1103/PhysRevMaterials.5.095002

PlumX: Orbital occupancy and hybridization in strained SrVO3 epitaxial films
Oxygen packaging in transition metal oxides determines the metal-oxygen hybridization and electronic occupation at metal orbitals. Strontium vanadate (SrVO3), having a single electron in a 3d orbital, is thought to be the simplest example of strongly correlated metallic oxides. Here, we determine the effects of epitaxial strain on the electronic properties of SrVO3 thin films, where the metal-oxide sublattice is corner connected.

Oxides

  • Hits: 354

Effect of Humidity on the Writing Speed and Domain Wall Dynamics of Ferroelectric Domains

Título : Effect of Humidity on the Writing Speed and Domain Wall Dynamics of Ferroelectric Domains
Autores: Irena Spasojevic, Albert Verdaguer, Gustau Catalan, Neus Domingo
Citation and DOI: Adv. Electron. Mater. 2021, 2100650. 
DOI: https://doi.org/10.1002/aelm.202100650
PlumX: Effect of Humidity on the Writing Speed and Domain Wall Dynamics of Ferroelectric Domains
The switching dynamics of ferroelectric polarization under electric fields depends on the availability of screening charges in order to stabilize the switched polarization. In ferroelectrics, thin films with exposed surfaces investigated by piezoresponse force microscopy (PFM), the main source of external screening charges is the atmosphere and the water neck, and therefore relative humidity (RH) plays a major role.

Oxides

  • Hits: 387

Common workflows for computing material properties using different quantum engines

Título : Common workflows for computing material properties using different quantum engines
Autores: Sebastiaan P. Huber, Emanuele Bosoni, Marnik Bercx, Jens Bröder, Augustin Degomme, Vladimir Dikan, Kristjan Eimre, Espen Flage-Larsen, Alberto Garcia, Luigi Genovese, Dominik Gresch, Conrad Johnston, Guido Petretto, Samuel Poncé, Gian-Marco Rignanese, Christopher J. Sewell, Berend Smit, Vasily Tseplyaev, Martin Uhrin, Daniel Wortmann, Aliaksandr V. Yakutovich, Austin Zadoks, Pezhman Zarabadi-Poor, Bonan Zhu, Nicola Marzari & Giovanni Pizzi
Citation and DOI:

npj Comput Mater 7, 136 (2021)
DOI: https://doi.org/10.1038/s41524-021-00594-6

PlumX: Common workflows for computing material properties using different quantum engines
The prediction of material properties based on density-functional theory has become routinely common, thanks, in part, to the steady increase in the number and robustness of available simulation packages. This plurality of codes and methods is both a boon and a burden. While providing great opportunities for cross-verification, these packages adopt different methods, algorithms, and paradigms, making it challenging to choose, master, and efficiently use them. We demonstrate how developing common interfaces for workflows that automatically compute material properties greatly simplifies interoperability and cross-verification.

Oxides

  • Hits: 308

Polarization and Resistive Switching in Epitaxial 2 nm Hf0.5Zr0.5O2 Tunnel Junctions

Título : Polarization and Resistive Switching in Epitaxial 2 nm Hf0.5Zr0.5O2 Tunnel Junctions
Autores: Milena Cervo Sulzbach, Huan Tan, Saúl Estandía, Jaume Gàzquez, Florencio Sánchez, Ignasi Fina*, and Josep Fontcuberta*
Citation and DOI:
ACS Appl. Electron. Mater. 2021, 3, 8, 3657–3666
Publication Date:August 12, 2021
DOI: https://doi.org/10.1021/acsaelm.1c00604
PlumX: Polarization and Resistive Switching in Epitaxial 2 nm Hf0.5Zr0.5O2 Tunnel Junctions
In the quest for reliable and power-efficient memristive devices, ferroelectric tunnel junctions are being investigated as potential candidates. Complementary metal oxide semiconductor-compatible ferroelectric hafnium oxides are at the forefront. However, in epitaxial tunnel devices with thicknesses around ≈4–6 nm, the relatively high tunnel energy barrier produces a large resistance that challenges their implementation. Here, we show that ferroelectric and electroresistive switching can be observed in ultrathin 2 nm epitaxial Hf0.5Zr0.5O2 (HZO) tunnel junctions in large area capacitors (≈300 μm2).

Oxides

  • Hits: 465

Switchable photovoltaic response in hexagonal LuMnO3 single crystals

Título : Switchable photovoltaic response in hexagonal LuMnO3 single crystals
Autores: Yunwei Sheng, Ignasi Fina, Marin Gospodinov, and Josep Fontcuberta
Citation and DOI: Appl. Phys. Lett. 118, 232902 (2021)
DOI: https://doi.org/10.1063/5.0053379
PlumX: Switchable photovoltaic response in hexagonal LuMnO3 single crystals
Hexagonal manganites, such as h-LuMnO3, are ferroelectric with its polar axis along the hexagonal axis and have a narrow electronic bandgap (≈1.5 eV). Using Pt electrodes, h-LuMnO3 single crystals display a strong rectification, characteristic of a Schottky diode, and a large photoresponse. It is found that the short circuit photocurrent density Jsc along the polar axis is modulated (up to 25%) by the direction of the ferroelectric polarization P, leading to a short circuit photocurrent loop that mimics the ferroelectric polarization. However, a non-switchable Jsc persists. Diffusion photocurrent is shown to dominate current-in-plane measurements and contributes to the non-switchable Jsc.

Oxides

  • Hits: 463

Giant Tuning of Electronic and Thermoelectric Properties by Epitaxial Strain in p-Type Sr-Doped LaCrO3 Transparent Thin Films

Título : Giant Tuning of Electronic and Thermoelectric Properties by Epitaxial Strain in p-Type Sr-Doped LaCrO3 Transparent Thin Films
Autores: Dong Han, Rahma Moalla, Ignasi Fina, Valentina M. Giordano, Marc d’Esperonnat, Claude Botella, Geneviève Grenet, Régis Debord, Stéphane Pailhès, Guillaume Saint-Girons, and Romain Bachelet*
Citation and DOI:
ACS Appl. Electron. Mater. 2021, 3, 8, 3461–3471 Publication Date:July 28, 2021
DOI: https://doi.org/10.1021/acsaelm.1c00425
PlumX: Giant Tuning of Electronic and Thermoelectric Properties by Epitaxial Strain in p-Type Sr-Doped LaCrO3 Transparent Thin Films
The impact of epitaxial strain on the structural, electronic, and thermoelectric properties of p-type transparent Sr-doped LaCrO3 thin films has been investigated. For this purpose, high-quality fully strained La0.75Sr0.25CrO3 (LSCO) epitaxial thin films were grown by molecular beam epitaxy on three different (pseudo)cubic (001)-oriented perovskite oxide substrates: LaAlO3, (LaAlO3)0.3(Sr2AlTaO6)0.7, and DyScO3. The lattice mismatch between the LSCO films and the substrates induces in-plane strain ranging from −2.06% (compressive) to +1.75% (tensile).

Oxides

  • Hits: 465

Magnetocapacitance effect and magnetoelectric coupling in type-II multiferroic HoFeWO 6

Título : Magnetocapacitance effect and magnetoelectric coupling in type-II multiferroic HoFeWO6
Autores: Moein Adnani,*, Melissa Gooch, Liangzi Deng, Stefano Agrestini, Javier Herrero-Martin, Hung-Cheng Wu, Chung-Kai Chang, Taha Salavati-fard, Narayan Poudel, José Luis García-Muñoz, Samira Daneshmandi, Zheng Wu, Lars C. Grabow, Yen-Chung Lai, Hung-Duen Yang, Eric Pellegrin, and Ching-Wu Chu
Citation and DOI:
Phys. Rev. B 103, 094110 – Published 17 March 2021
DOI: https://doi.org/10.1103/PhysRevB.103.094110
PlumX: Magnetocapacitance effect and magnetoelectric coupling in type-II multiferroic HoFeWO6
We have investigated the multiferroicity and magnetoelectric (ME) coupling in HoFeWO6. With a noncentrosymmetric polar structure (space group Pna21) at room temperature, this compound shows an onset of electric polarization with an antiferromagnetic ordering at the Néel temperature (TN) of 17.8 K. The magnetic properties of the polycrystalline samples were studied by DC and AC magnetization and heat capacity measurements.

Oxides

  • Hits: 458

Insights into the atomic structure of the interface of ferroelectric Hf0.5Zr0.5O2 grown epitaxially on La2/3Sr1/3MnO3

Título :

Insights into the atomic structure of the interface of ferroelectric Hf0.5Zr0.5O2 grown epitaxially on La2/3Sr1/3MnO3

Autores:

Saúl Estandía, Tengfei Cao, Rohan Mishra, Ignasi Fina, Florencio Sánchez, and Jaume Gazquez

Citation and DOI:

Phys. Rev. Materials 5, 074410 – Published 28 July 2021
DOI: 10.1103/PhysRevMaterials.5.074410

PlumX: Insights into the atomic structure of the interface of ferroelectric Hf0.5Zr0.5O2 grown epitaxially on La2/3Sr1/3MnO3
Epitaxial growth of Hf0.5Zr0.5O2 (HZO) thin films allows for the stabilization of the metastable orthorhombic phase with robust ferroelectric properties. So far, the ferroelectric phase is most commonly stabilized on perovskite substrates upon insertion of a buffer layer of La2/3Sr1/3MnO3 (LSMO).

Oxides

  • Hits: 709

Symmetry mode analysis of distorted polar/nonpolar structures in A-site ordered SmBaMn2O6 perovskite

Título : Symmetry mode analysis of distorted polar/nonpolar structures in A-site ordered SmBaMn2O6 perovskite
Autores:

J. Blasco, G. Subías, J. L. García Muñoz, F. Fauth, M. C. Sánchez, and J. García

Citation and DOI:

Phys. Rev. B 103, 214110 – Published 21 June 2021
DOI: 10.1103/PhysRevB.103.214110

PlumX: Symmetry mode analysis of distorted polar/nonpolar structures in A-site ordered SmBaMn2O6 perovskite
We present a comprehensive structural study of the charge-orbital ordering and magnetic phase transitions observed in the A-site ordered SmBaMn2O6 perovskite combining synchrotron radiation x-ray powder diffraction and symmetry-adapted modes analysis. InSmBaMn2O6, successive phase transitions in charge, spin, and lattice degrees of freedom take place with decreasing temperature at TCO1380K,TCO2190K, and TN250K.

Oxides

  • Hits: 612

Thickness effect on ferroelectric properties of La-doped HfO2 epitaxial films down to 4.5 nm

Título : Thickness effect on ferroelectric properties of La-doped HfO2 epitaxial films down to 4.5 nm
Autores:
Citation and DOI: J. Mater. Chem. C, 2021,
DOI: 10.1039/D1TC02512K
PlumX: Thickness effect on ferroelectric properties of La-doped HfO2 epitaxial films down to 4.5 nm
Stabilization of the orthorhombic phase of HfO2 with La allows very high polarization and endurance. However, these properties have not been confirmed yet in films having thickness of less than 10 nm. We have grown (111)-oriented La (2 at%) doped epitaxial HfO2 films on SrTiO3(001) and Si(001) substrates, and we report on the thickness dependence of their ferroelectric properties.

Oxides

  • Hits: 633

Optical Plasmon Excitation in Transparent Conducting SrNbO3 and SrVO3 Thin Films

Título : Optical Plasmon Excitation in Transparent Conducting SrNbO3 and SrVO3 Thin Films
Autores: Mathieu Mirjolet, Mikko Kataja, Tommi K. Hakala, Philipp Komissinskiy, Lambert Alff, Gervasi Herranz, Josep Fontcuberta
Citation and DOI: Adv. Optical Mater. 2021, 2100520. 
DOI: 10.1002/adom.202100520
PlumX: Optical Plasmon Excitation in Transparent Conducting SrNbO3 and SrVO3 Thin Films

From catalysis and flat panel displays to photovoltaics, transparent and conducting transition metal oxides are gaining momentum toward more sustainable and cost-efficient applications.

Here it is shown that, without using phase-matching arrangements, bulk plasmons can be excited in continuous epitaxial films of metallic SrVO3 and SrNbO3, with plasma absorption edges at visible range, and tuned mainly by electron correlations and phonon dressing. Films can be made reflective or transparent at whish.

Oxides

  • Hits: 549

Electron–Phonon Coupling and Electron–Phonon Scattering in SrVO3

Título : Electron–Phonon Coupling and Electron–Phonon Scattering in SrVO3
Autores: Mathieu Mirjolet, Francisco Rivadulla, Premysl Marsik, Vladislav Borisov, Roser Valentí, Josep Fontcuberta
Citation and DOI: Adv. Sci. 2021, 2004207. 
DOI: https://doi.org/10.1002/advs.202004207
PlumX: Electron–Phonon Coupling and Electron–Phonon Scattering in SrVO3
The nature of electron-electron and electron-lattice interactions in metallic oxides is revised. The common wisdom is that the strong correlations among electrons determine their properties. Here we argue that the unavoidable coupling between free electrons and the lattice in ionic materials leads to the formation of polarons. These are carriers dressed by a lattice distortion that travel with them and largely determine the transport and some optical properties.

Oxides

  • Hits: 651

A new density-modification procedure extending the application of the recent |ρ|-based phasing algorithm to larger crystal structures

Título : A new density-modification procedure extending the application of the recent |ρ|-based phasing algorithm to larger crystal structures
Autores: Jordi Rius* and Xavier Torrelles
Citation and DOI: Acta Cryst. (2021). A77339-347
PlumX: A new density-modification procedure extending the application of the recent |ρ|-based phasing algorithm to larger crystal structures
The incorporation of the new peakness-enhancing fast Fourier transform compatible ipp procedure (ipp = inner-pixel preservation) into the recently published SM algorithm based on |ρ| [Rius (2020). Acta Cryst A76, 489–493] improves its phasing efficiency for larger crystal structures with atomic resolution data. Its effectiveness is clearly demonstrated via a collection of test crystal structures (taken from the Protein Data Bank) either starting from random phase values or by using the randomly shifted modulus function (a Patterson-type synthesis) as initial ρ estimate.

Oxides

  • Hits: 578

Current-Induced Magnetization Control in Insulating Ferrimagnetic Garnets

Título : Current-Induced Magnetization Control in Insulating Ferrimagnetic Garnets
Autores: Can Onur Avci
Citation and DOI:

Journal of the Physical Society of Japan, 90, 081007 (2021) 10.7566/JPSJ.90.081007

PlumX: Current-Induced Magnetization Control in Insulating Ferrimagnetic Garnets
The research into insulating ferrimagnetic garnets has gained enormous momentum in the past decade. This is partly due to the improvement in the techniques to grow high-quality ultrathin films with desirable properties and the advances in understanding the spin transport within the ferrimagnetic garnets and through their interfaces with conducting materials. In recent years, we have seen remarkable progress in controlling the magnetization state of ferrimagnetic garnets by electrical means in suitable heterostructures and device architectures.

Oxides

  • Hits: 572

Stabilization of the Ferroelectric Phase in Epitaxial Hf1–xZrxO2 Enabling Coexistence of Ferroelectric and Enhanced Piezoelectric Properties

Título : Stabilization of the Ferroelectric Phase in Epitaxial Hf1–xZrxO2 Enabling Coexistence of Ferroelectric and Enhanced Piezoelectric Properties
Autores: Tingfeng Song, Huan Tan, Nico Dix, Rahma Moalla, Jike Lyu, Guillaume Saint-Girons, Romain Bachelet, Florencio Sánchez*, and Ignasi Fina*
Citation and DOI:
ACS Appl. Electron. Mater. 2021, 3, 5, 2106–2113
Publication Date:April 22, 2021
DOI: https://doi.org/10.1021/acsaelm.1c00122
PlumX: Stabilization of the Ferroelectric Phase in Epitaxial Hf1–xZrxO2 Enabling Coexistence of Ferroelectric and Enhanced Piezoelectric Properties
Systematic studies on polycrystalline Hf1–xZrxO2 films with varying Zr contents show that HfO2 films are paraelectric (monoclinic). If the Zr content is increased, films become ferroelectric (orthorhombic) and then antiferroelectric (tetragonal). HfO2 shows very good insulating properties and it is used in metal-oxide-semiconductor field-effect devices, while ZrO2 shows good piezoelectric properties, but it is antiferroelectric. In between, Hf0.5Zr0.5O2 shows good ferroelectric properties at the expense of poorer insulating and piezoelectric properties than HfO2 and ZrO2, respectively.

Oxides

  • Hits: 883

Epitaxial Ferroelectric HfO2 Films: Growth, Properties, and Devices

Título : Epitaxial Ferroelectric HfO2 Films: Growth, Properties, and Devices
Autores: Ignasi Fina* and Florencio Sánchez*
Citation and DOI:
ACS Appl. Electron. Mater. 2021, XXXX, XXX, XXX-XXX
Publication Date:April 13, 2021
DOI: https://doi.org/10.1021/acsaelm.1c00110
PlumX: Epitaxial Ferroelectric HfO2 Films: Growth, Properties, and Devices
About ten years after ferroelectricity was first reported in doped HfO2 polycrystalline films, there is tremendous interest in this material and ferroelectric oxides are once again in the spotlight of the memories industry. Great efforts are being made to understand and control ferroelectric properties. Epitaxial films, which have fewer defects and a more controlled microstructure than polycrystalline films, can be very useful for this purpose. Epitaxial films of ferroelectric HfO2 have been much less investigated, but after the first report in 2015 significant progress has been achieved.

Oxides

  • Hits: 748

Structure and phase transitions in A-site ordered RBaMn2O6(R=Pr,Nd) -perovskites with a polar ground state

Título : Structure and phase transitions in A-site ordered Ba MnO(R = Pr, Nd) perovskites with a polar ground state
Autores: J. Blasco,*, G. Subías, M. L. Sanjuán, J. L. García-Muñoz, F. Fauth, and J. García
Citation and DOI: Phys. Rev. B 103, 064105 – Published 18 February 2021
DOI: https://doi.org/10.1103/PhysRevB.103.064105
PlumX: Structure and phase transitions in A-site ordered RBaMn2O6(R=Pr,Nd) perovskites with a polar ground state
We report here a structural study of RBaMn2O6 (R=La, Pr, and Nd) compounds by means of synchrotron radiation x-ray powder diffraction and Raman spectroscopy. The three compounds are A-site ordered perovskites adopting the prototypical tetragonal structure at high temperature. A ferromagnetic transition is observed in the LaBaMn2O6 sample and the lattice parameters undergo anisotropic changes at TC related to the orientation of the magnetic moments.

Oxides

  • Hits: 647

Tuning the tilting of the spiral plane by Mn doping in YBaCuFeO5 multiferroic

Título : Tuning the tilting of the spiral plane by Mn doping in YBaCuFeO5 multiferroic
Autores: Xiaodong Zhanga, Arnau Romaguera, Oscar Fabelo, Francois Fauth, Javier Herrero-Martín, José Luis García-Muñoz
Citation and DOI: Acta Materialia, Volume 206, 2021, 116608, ISSN 1359-6454,
DOI: https://doi.org/10.1016/j.actamat.2020.116608
PlumX: Tuning the tilting of the spiral plane by Mn doping in YBaCuFeO5 multiferroic
The layered perovskite YBaCuFeO5 (YBCFO) is considered one of the best candidates to high-temperature chiral multiferroics with strong magnetoelectric coupling. In RBaCuFeO5 perovskites (R: rare-earth or Y) A-site cations are fully ordered whereas their magnetic properties strongly depend on the preparation process. They exhibit partial cationic disorder at the B-site that generates a magnetic spiral stabilized through directionally assisted long range coupling between canted locally frustrated spins.

Oxides

  • Hits: 786

New Sensitive and Selective Chemical Sensors for Ni2+ and Cu2+ Ions: Insights into the Sensing Mechanism through DFT Methods

Título : New Sensitive and Selective Chemical Sensors for Ni2+ and Cu2+ Ions: Insights into the Sensing Mechanism through DFT Methods
Autores: Manuel A. Treto-Suárez, Jorge Tapia, Yoan Hidalgo-Rosa, Dayan Páez-Hernández, Elies Molins, Ximena Zarate*, and Eduardo Schott*
Citation and DOI:
J. Phys. Chem. A 2020, 124, 32, 6493–6503
Publication Date:July 8, 2020
DOI: https://doi.org/10.1021/acs.jpca.0c03834
PlumX: New Sensitive and Selective Chemical Sensors for Ni2+ and Cu2+ Ions: Insights into the Sensing Mechanism through DFT Methods
We report the synthesis and theoretical study of two new colorimetric chemosensors with special selectivity and sensitivity to Ni2+ and Cu2+ ions over other metal cations in the CH3CN/H2O solution. Compounds (E)-4-((2-nitrophenyl)diazenyl)-N,N-bis(pyridin-2-ylmethyl)aniline (A) and (E)-4-((3-nitrophenyl)diazenyl)-N,N-bis(pyridin-2-ylmethyl)aniline (B) exhibited a drastic color change from yellow to colorless, which allows the detection of the mentioned metal cations through different techniques.

Oxides

  • Hits: 788

Silicon nanowires as acetone-adsorptive media for diabetes diagnosis

Autores: Francisco De Santiago, José Eduardo Santana, Álvaro Miranda, Luis Antonio Pérez, Riccardo Rurali, Miguel Cruz-Irissona
Citation and DOI: Applied Surface Science, Volume 547, 2021, 149175, ISSN 0169-4332,
https://doi.org/10.1016/j.apsusc.2021.149175
PlumX: Silicon nanowires as acetone-adsorptive media for diabetes diagnosis
Early detection of diabetes, a worldwide health issue, is key for its successful treatment. Acetone is a marker of diabetes, and efficient, non-invasive detection can be achieved with the use of nanotechnology. In this paper we investigate the effect of acetone adsorption on the electronic properties of silicon nanowires (SiNWs) by means of density functional theory.

Oxides

  • Hits: 869

Soft‐Chemistry‐Assisted On‐Chip Integration of Nanostructured α‐Quartz Microelectromechanical System

Título : Soft‐Chemistry‐Assisted On‐Chip Integration of Nanostructured α‐Quartz Microelectromechanical System
Autores: Claire Jolly, Andres Gomez, David Sánchez‐Fuentes, Dilek Cakiroglu, Raïssa Rathar, Nicolas Maurin, Ricardo Garcia‐Bermejo, Benoit Charlot, Martí Gich, Michael Bahriz, Laura Picas, Adrian Carretero‐Genevrier
Citation and DOI: Adv. Mater. Technol. 2021, 2000831
DOI: https://doi.org/10.1002/admt.202000831
PlumX: Soft‐Chemistry‐Assisted On‐Chip Integration of Nanostructured α‐Quartz Microelectromechanical System
The development of advanced piezoelectric α‐quartz microelectromechanical system (MEMS) for sensing and precise frequency control applications requires the nanostructuration and on‐chip integration of this material on silicon material.

Cover, Oxides

  • Hits: 767

Critical Effect of Bottom Electrode on Ferroelectricity of Epitaxial Hf0.5Zr0.5O2 Thin Films

Título : Critical Effect of Bottom Electrode on Ferroelectricity of Epitaxial Hf0.5Zr0.5O2 Thin Films
Autores: Saúl Estandía, Jaume Gazquez, Maria Varela, N. Dix, Mengdi Qian, Raul Solanas, Ignasi Fina and Florencio Sanchez
Citation and DOI:

J. Mater. Chem. C, 9, 3486 - 3492 (2021)
DOI: https://doi.org/10.1039/D0TC05853J

 

PlumX: Critical Effect of Bottom Electrode on Ferroelectricity of Epitaxial Hf0.5Zr0.5O2 Thin Films
Epitaxial orthorhombic Hf0.5Zr0.5O2 (HZO) films on La0.67Sr0.33MnO3 (LSMO) electrodes show robust ferroelectricity, with high polarization, endurance and retention. However, no similar results have been achieved using other perovskite electrodes so far. Here, LSMO and other perovskite electrodes are compared.

Oxides

  • Hits: 802

Metallic Diluted Dimerization in VO2 Tweeds

Título : Metallic Diluted Dimerization in VO2 Tweeds
Autores: Felip Sandiumenge, Laura Rodríguez, Miguel Pruneda, César Magén, José Santiso, Gustau Catalan
Citation and DOI: Adv. Mater. 2021, 2004374
DOI: https://doi.org/10.1002/adma.202004374
PlumX: Metallic Diluted Dimerization in VO2 Tweeds
Though first order transitions are thought to be abrupt, materials find cunning ways to smooth the jump. Here we show that VO2 chooses making beautiful tapestries at the atomic scale. To see how, and how they affect its intriguing metal-insulator transition, continue reading:

Oxides

  • Hits: 752

Facile Chemical Route to Prepare Water Soluble Epitaxial Sr3Al2O6 Sacrificial Layers for Free‐Standing Oxides

Título : Facile Chemical Route to Prepare Water Soluble Epitaxial Sr3Al2O6 Sacrificial Layers for Free‐Standing Oxides
Autores: Pol Salles, Ivan Caño, Roger Guzman, Camilla Dore, Agustín Mihi, Wu Zhou, Mariona Coll
Citation and DOI: Adv. Mater. Interfaces 2021, 2001643. 
DOI: https://doi.org/10.1002/admi.202001643
PlumX: Facile Chemical Route to Prepare Water Soluble Epitaxial Sr3Al2O6 Sacrificial Layers for Free‐Standing Oxides
The growth of epitaxial complex oxides has been essentially limited to specific substrates that can induce epitaxial growth and stand high temperature thermal treatments. These restrictions hinder the opportunity to manipulate and integrate such materials into new artificial heterostructures including the use of polymeric and silicon substrates and study emergent phenomena for novel applications.

Oxides

  • Hits: 838

Non-volatile optical switch of resistance in photoferroelectric tunnel junctions

Autores: Xiao Long, Huan Tan, Florencio Sánchez, Ignasi Fina & Josep Fontcuberta
Citation and DOI: Nat Commun 12, 382 (2021).
https://doi.org/10.1038/s41467-020-20660-9
PlumX: Non-volatile optical switch of resistance in photoferroelectric tunnel junctions
In the quest for energy efficient and fast memory elements, optically controlled ferroelectric memories are promising candidates. Here, we show that, by taking advantage of the imprint electric field existing in the nanometric BaTiO3 films and their photovoltaic response at visible light, the polarization of suitably written domains can be reversed under illumination. We exploit this effect to trigger and measure the associate change of resistance in tunnel devices.

Oxides

  • Hits: 794

Rapid Thermal Annealing of Double Perovskite Thin Films Formed by Polymer Assisted Deposition

Título : Rapid Thermal Annealing of Double Perovskite Thin Films Formed by Polymer Assisted Deposition
Autores: Hailin Wang, Carlos Frontera, Benjamín Martínez * and Narcís Mestres *
Citation and DOI: Materials 202013(21), 4966
DOI: https://doi.org/10.3390/ma13214966
PlumX: Rapid Thermal Annealing of Double Perovskite Thin Films Formed by Polymer Assisted Deposition

The annealing process is an important step common to epitaxial films prepared by chemical solution deposition methods. It is so because the final microstructure of the films can be severely affected by the precise features of the thermal processing. In this work we analyze the structural and magnetic properties of double perovskite La2CoMnO6 and La2NiMnO6 epitaxial thin films prepared by polymer-assisted deposition (PAD) and crystallized by rapid thermal annealing (RTA).

Oxides

  • Hits: 985

Local electric-field control of multiferroic spin-spiral domains in TbMnO3

Título : Local electric-field control of multiferroic spin-spiral domains in TbMnO3
Autores: Peggy Schoenherr, Sebastian Manz, Lukas Kuerten, Konstantin Shapovalov, Ayato Iyama, Tsuyoshi Kimura, Manfred Fiebig & Dennis Meier
Citation and DOI:

npj Quantum Mater. 5, 86 (2020)
DOI: https://doi.org/10.1038/s41535-020-00289-z

PlumX: Metallacarboranes as Photoredox Catalysts in Water

Spin-spiral multiferroics exhibit a magnetoelectric coupling effects, leading to the formation of hybrid domains with inseparably entangled ferroelectric and antiferromagnetic order parameters. Due to this strong magnetoelectric coupling, conceptually advanced ways for controlling antiferromagnetism become possible and it has been reported that electric fields and laser pulses can reversibly switch the antiferromagnetic order.

Oxides

  • Hits: 905

Thermal evolution of ferroelectric behavior in epitaxial Hf0.5Zr0.5O2

Título : Thermal evolution of ferroelectric behavior in epitaxial Hf0.5Zr0.5O2
Autores: J. W. Adkins, I. Fina, F. Sánchez, S. R. Bakaul, and J. T. Abiade
Citation and DOI:

Appl. Phys. Lett. 117, 142902 (2020)
DOI: https://doi.org/10.1063/5.0015547

PlumX: Thermal evolution of ferroelectric behavior in epitaxial Hf0.5Zr0.5O2
Herein, we report a cryogenic-temperature study on the evolution of the ferroelectric properties of epitaxial Hf0.5Zr0.5O2 thin films on silicon. Wake-up, endurance, and fatigue of these films are found to be intricately correlated, strongly hysteretic, and dependent on available thermal energy.

Oxides

  • Hits: 1113

Engineering Polar Oxynitrides: Hexagonal Perovskite BaWON2

Título : Engineering Polar Oxynitrides: Hexagonal Perovskite BaWON2
Autores: Dr. Judith Oró‐Solé, Dr. Ignasi Fina, Dr. Carlos Frontera, Dr. Jaume Gàzquez, Dr. Clemens Ritter, Marina Cunquero, Dr. Pablo Loza‐Alvarez, Dr. Sergio Conejeros, Prof. Pere Alemany, Prof. Enric Canadell, Prof. Josep Fontcuberta, Prof. Amparo Fuertes. 
Citation and DOI: Angew. Chem. Int. Ed. 2020, 59, 18395 – 18399.
DOI: https://doi.org/10.1002/ange.202006519
PlumX: Engineering Polar Oxynitrides: Hexagonal Perovskite BaWON2

Non‐centrosymmetric polar compounds have important technological properties. Reported perovskite oxynitrides show centrosymmetric structures, and for some of them high permittivities have been observed and ascribed to local dipoles induced by partial order of nitride and oxide.

Oxides

  • Hits: 1049

Mechanical Softness of Ferroelectric 180° Domain Walls

Autores: Christina Stefani, Louis Ponet, Konstantin Shapovalov, Peng Chen, Eric Langenberg, Darrell G. Schlom, Sergey Artyukhin, Massimiliano Stengel, Neus Domingo, and Gustau Catalan.
Citation and DOI: Phys. Rev. X 10, 041001 – Published 1 October 2020
DOI:https://doi.org/10.1103/PhysRevX.10.041001
PlumX: Mechanical Softness of Ferroelectric 180° Domain Walls

Using scanning probe microscopy, we measure the out-of-plane mechanical response of ferroelectric 180° domain walls and observe that, despite separating domains that are mechanically identical, the walls appear mechanically distinct—softer—compared to the domains.

Oxides

  • Hits: 923

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