Oxides for new-generation electronics

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

Written by Jags on 14 September 2021.

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 La_0.75Sr_0.25CrO₃ (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).

Hits: 138

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

Written by Jags on 10 September 2021.

Título : Magnetocapacitance effect and magnetoelectric coupling in type-II multiferroic

{HoFeWO}_{6}

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

Ho Fe W O_{6}

. With a noncentrosymmetric polar structure (space group Pna

2_{1}

) at room temperature, this compound shows an onset of electric polarization with an antiferromagnetic ordering at the Néel temperature (

T_{N}

) of 17.8 K. The magnetic properties of the polycrystalline samples were studied by DC and AC magnetization and heat capacity measurements.

Hits: 173

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

Written by Anna on 31 August 2021.

Título :

Insights into the atomic structure of the interface of ferroelectric Hf_0.5Zr_0.5O₂ grown epitaxially on La_2/3Sr_1/3MnO₃

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 Hf_0.5Zr_0.5O₂ grown epitaxially on La_2/3Sr_1/3MnO₃

Epitaxial growth of

{Hf}_{0.5} {Zr}_{0.5} O_{2}

(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

{La}_{2 / 3} {Sr}_{1 / 3} Mn O_{3}

(LSMO).

Hits: 283

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

Written by Anna on 13 August 2021.

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

SmBa {Mn}_{2} O_{6}

perovskite combining synchrotron radiation x-ray powder diffraction and symmetry-adapted modes analysis. In

SmBa {Mn}_{2} O_{6}

, successive phase transitions in charge, spin, and lattice degrees of freedom take place with decreasing temperature at

T_{CO 1} \approx 380 K, T_{CO 2} \approx 190 K

, and

T_{N} \approx 250 K

.

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

Written by Anna on 10 August 2021.

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

Autores: Tingfeng Song, Romain Bachelet, Guillaume Saint-Girons, Nico Dix, Ignasi Fina and Florencio Sanchez

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.

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Optical Plasmon Excitation in Transparent Conducting SrNbO3 and SrVO3 Thin Films

Written by Jags on 27 July 2021.

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.

Hits: 317

Electron–Phonon Coupling and Electron–Phonon Scattering in SrVO3

Written by Jags on 20 July 2021.

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.

Hits: 375

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

Written by Jags on 13 July 2021.

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). A77, 339-347

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 S_M 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.

Hits: 346

Current-Induced Magnetization Control in Insulating Ferrimagnetic Garnets

Written by Jags on 29 June 2021.

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.

Hits: 368

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

Written by Jags on 18 June 2021.

Título : Stabilization of the Ferroelectric Phase in Epitaxial Hf_1–xZr_xO₂ 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 Hf_1–xZr_xO₂ 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, Hf_0.5Zr_0.5O₂ shows good ferroelectric properties at the expense of poorer insulating and piezoelectric properties than HfO₂ and ZrO₂, respectively.

Hits: 573

Epitaxial Ferroelectric HfO2 Films: Growth, Properties, and Devices

Written by Jags on 25 May 2021.

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.

Hits: 460

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

Written by Jags on 14 May 2021.

Título : Structure and phase transitions in A-site ordered R Ba Mn₂O₆(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

R Ba {Mn}_{2} O_{6}

(

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

LaBa {Mn}_{2} O_{6}

sample and the lattice parameters undergo anisotropic changes at

T_{C}

related to the orientation of the magnetic moments.

Hits: 440

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

Written by icmab on 23 April 2021.

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.

Hits: 535

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

Written by icmab on 09 April 2021.

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.

Hits: 570

Silicon nanowires as acetone-adsorptive media for diabetes diagnosis

Written by icmab on 06 April 2021.

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.

Hits: 631

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

Written by icmab on 30 March 2021.

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.

Hits: 544

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

Written by icmab on 26 March 2021.

Título : Critical Effect of Bottom Electrode on Ferroelectricity of Epitaxial Hf_0.5Zr_0.5O₂ 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 Hf_0.5Zr_0.5O₂ Thin Films

Epitaxial orthorhombic Hf_0.5Zr_0.5O₂ (HZO) films on La_0.67Sr_0.33MnO₃ (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.

Hits: 591

Metallic Diluted Dimerization in VO2 Tweeds

Written by icmab on 19 March 2021.

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:

Hits: 532

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

Written by icmab on 14 March 2021.

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.

Hits: 627

Non-volatile optical switch of resistance in photoferroelectric tunnel junctions

Written by icmab on 09 March 2021.

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.

Hits: 562

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

Written by icmab on 23 February 2021.

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 2020, 13(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).

Hits: 688

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

Written by icmab on 05 February 2021.

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.

Hits: 661

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

Written by icmab on 15 December 2020.

Título : Thermal evolution of ferroelectric behavior in epitaxial Hf_0.5Zr_0.5O₂

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 Hf_0.5Zr_0.5O₂ 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.

Hits: 862

Engineering Polar Oxynitrides: Hexagonal Perovskite BaWON2

Written by icmab on 11 December 2020.

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.

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Mechanical Softness of Ferroelectric 180° Domain Walls

Written by icmab on 02 December 2020.

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.

Hits: 706

Discovery of highly polarizable semiconductors BaZrS3 and Ba3Zr2S7

Written by icmab on 27 November 2020.

Título : Discovery of highly polarizable semiconductors BaZr S₃ and Ba₃ Zr₂ S₇

Autores: Stephen Filippone, Boyang Zhao, Shanyuan Niu, Nathan Z. Koocher, Daniel Silevitch, Ignasi Fina, James M. Rondinelli, Jayakanth Ravichandran, and R. Jaramillo.

Citation and DOI: Phys. Rev. Materials 4, 091601(R) – Published 8 September 2020.
DOI: https://doi.org/10.1103/PhysRevMaterials.4.091601

PlumX: Discovery of highly polarizable semiconductors BaZrS3 and Ba3Zr2S7

There are few known semiconductors exhibiting both strong optical response and large dielectric polarizability. Inorganic materials with large dielectric polarizability tend to be wide-band gap complex oxides. Semiconductors with a strong photoresponse to visible and infrared light tend to be weakly polarizable. Interesting exceptions to these trends are halide perovskites and phase-change chalcogenides.

Hits: 816

Magnetic droplet solitons

Written by icmab on 10 November 2020.

Autores: Ferran Macià, and Andrew D. Kent.

Citation and DOI: Journal of Applied Physics
https://doi.org/10.1063/5.0018251

PlumX: Magnetic droplet solitons

Magnetic droplet solitons are dynamical magnetic textures that form due to an attractive interaction between spin waves in thin films with perpendicular magnetic anisotropy. Spin currents and the spin torques associated with these currents enable their formation as they provide a means to excite non-equilibrium spin-wave populations and compensate their decay.

Hits: 816

Epitaxial Ferroelectric La-doped Hf0.5Zr0.5O2 Thin Films

Written by icmab on 03 November 2020.

Título : Epitaxial Ferroelectric La-Doped Hf_0.5Zr_0.5O₂ Thin Films

Autores: Tingfeng Song, Romain Bachelet, Guillaume Saint-Girons, Raul Solanas, Ignasi Fina, and Florencio Sanchez

Citation and DOI: ACS Appl. Electron. Mater. 2020
Publication Date: September 14, 2020
https://doi.org/10.1021/acsaelm.0c00560

PlumX: Epitaxial Ferroelectric La-doped Hf0.5Zr0.5O2 Thin Films

Doping ferroelectric Hf_0.5Zr_0.5O₂ with La is a promising route to improve endurance. However, the beneficial effect of La on the endurance of polycrystalline films may be accompanied by degradation of the retention. We have investigated the endurance - retention dilemma in La-doped epitaxial films.

Hits: 1084

Conductivity control via minimally invasive anti-Frenkel defects in a functional oxide

Written by icmab on 23 October 2020.

Autores: Donald M. Evans, Theodor S. Holstad, Aleksander B. Mosberg, Didrik R. Småbråten, Per Erik Vullum, Anup L. Dadlani, Konstantin Shapovalov, Zewu Yan, Edith Bourret, David Gao, Jaakko Akola, Jan Torgersen, Antonius T. J. van Helvoort, Sverre M. Selbach & Dennis Meier.

Citation and DOI: Nat. Mater. (2020)
https://doi.org/10.1038/s41563-020-0765-x

PlumX: Conductivity control via minimally invasive anti-Frenkel defects in a functional oxide

Utilizing quantum effects in complex oxides, such as magnetism, multiferroicity and superconductivity, requires atomic-level control of the material’s structure and composition. In contrast, the continuous conductivity changes that enable artificial oxide-based synapses and multiconfigurational devices are driven by redox reactions and domain reconfigurations, which entail long-range ionic migration and changes in stoichiometry or structure.

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On the Promotion of Catalytic Reactions by Surface Acoustic Waves

Written by icmab on 25 September 2020.

Surface acoustic waves (SAW) allow to manipulate surfaces with potential applications in catalysis, sensor and nanotechnology. SAWs were shown to cause a strong increase in catalytic activity and selectivity in many oxidation and decomposition reactions on metallic and oxidic catalysts.

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Fatigue and retention in the growth window of ferroelectric Hf0.5Zr0.5O2 thin films

Written by icmab on 22 September 2020.

Título : Fatigue and retention in the growth window of ferroelectric Hf_0.5Zr_0.5O₂ thin films

Autores: Jike Lyu, Ignasi Fina, and Florencio Sánchez.
Appl. Phys. Lett. 117, 072901 (2020)
DOI: 10.1063/5.0017738

The growth window of epitaxial Hf_0.5Zr_0.5O₂ is established taking into account the main ferroelectric properties that films have to present simultaneously: high remanent polarization, low fatigue, and long retention.

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Visualization of moiré superlattices

Written by icmab on 18 September 2020.

Moiré superlattices in van der Waals heterostructures have given rise to a number of emergent electronic phenomena due to the interplay between atomic structure and electron correlations. Indeed, electrons in these structures have been recently found to exhibit a number of emergent properties that the individual layers themselves do not exhibit.

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Blocking of Conducting Channels Widens Window for Ferroelectric Resistive Switching in Interface‐Engineered Hf0.5Zr0.5O2 Tunnel Devices

Written by icmab on 21 July 2020.

Electroresistance is the functional property of resistive switching devices exploited in data storage and computing.

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Siesta: Recent developments and applications

Written by icmab on 07 July 2020.

A review of the present status, recent enhancements, and applicability of the Siesta program is presented. Since its debut in the mid-1990s, Siesta’s flexibility, efficiency, and free distribution have given advanced materials simulation capabilities to many groups worldwide.

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Weak localization competes with the quantum oscillations in a natural electronic superlattice: The case of Na1.5(PO2)4(WO3)20

Written by icmab on 03 July 2020.

We report an investigation of the combined structural and electronic properties of the bronze ${Na}_{1.5} {({PO}_{2})}_{4} {({WO}_{3})}_{20}$ .

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Photoinduced persistent electron accumulation and depletion in LaAlO3/SrTiO3 quantum wells

Written by icmab on 23 June 2020.

Spike-timing dependent plasticity (STDP) is a fundamental concept in neurobiology. Briefly, the relative timing of two neuron spikes reinforces or weakens the synapse between them, so that events caused by another should trigger spikes in a particular time order.

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Local manipulation of metamagnetism by strain nanopatterning

Written by icmab on 19 June 2020.

Near any phase transition order parameters of materials are strongly coupled to materials’ properties. Metamagnetic materials show phase transition between two magnetically ordered phases.

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High polarization, endurance and retention in sub-5 nm Hf0.5Zr0.5O2 films

Written by Jags on 05 June 2020.

Ferroelectric HfO₂ is a promising material for new memory devices, but significant improvement of important properties is necessary to reach applications. However, precedent literature shows that a dilemma between polarization, endurance and retention exists.

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Domain-Matching Epitaxy of Ferroelectric Hf0.5Zr0.5O2(111) on La2/3Sr1/3MnO3(001)

Written by Jags on 22 May 2020.

Epitaxial ferroelectric HfO₂ films are the most suitable to investigate intrinsic properties of the material and for prototyping emerging devices. Ferroelectric Hf_0.5Zr_0.5O₂(111) films were epitaxially stabilized on La_2/3Sr_1/3MnO₃(001) electrodes.

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Nanoscale rotational dynamics of four independent rotators confined in crowded crystalline layers

Written by icmab on 12 May 2020.

We report a study where Car–Parrinello molecular dynamics simulations and variable-temperature (30–300 K) ¹H spin–lattice relaxation time experiments nicely complement each other.

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