Spin transport and magnetization dynamics in ultra low damping epitaxial Co100-xFex/Ta bilayers
by Luis Avilés-Félix
Instituto de Nanociencia y Nanotecnología (CNEA-CONICET), Bariloche (RN), Argentina
Laboratorio Resonancias Magnéticas, Centro Atómico Bariloche, Bariloche (RN), Argentina
Instituto Balseiro, Univ. Nacional de Cuyo, Comisión Nacional de Energía Atómica, Rio Negro, Argentina
Wednesday, 13 September 2023
ICMAB - Sala d'Actes Carles Miravitlles and ONLINE. Register here to attend by Zoom.
The manipulation of the electron charge and the spin for the development of more efficient spintronic devices has been a topic of increasing interest in recent years. In particular, systems based on metallic ferromagnets with very low damping, a parameter that determines the speed and energy consumption during the operation of modern electronic devices, are excellent candidates for spin current injection. Recently, it has been reported that the Co25Fe75 alloy exhibits low magnetic damping, due to the features of the band structure in Co100-xFex alloys. In this seminar I will discuss the magnetic and spin transport characterization in Co100-xFex (20 nm)/Ta (10 nm) bilayer systems, with x = 65, 70, 75, 80, 85, grown on MgO (100) single crystal substrates. Characterization by Kerr magnetometry, transmission electron microscopy and ferromagnetic resonance allowed to determine that the Co100-xFex films grow epitaxially with a cubic structure rotated 45° with respect to the (100) direction of the MgO substrate plane, determining the easy and hard magnetization axes. On the other hand, spin transport characterization using spin pumping and inverse spin Hall effect allowed the detection of induced voltages associated to the conversion of spin current to charge current, of the order of 100 µV (Fe80Co20), demonstrating efficient conversion of spin current to charge current in Ta layers.
- Velázquez Rodriguez et al. – Manuscript submitted (2023)
- Velázquez Rodriguez et al. J. Phys. D: Appl. Phys 54, 325002 (2021)
- Velázquez Rodriguez et al. J. Magn. Magn. Mat. 504, 166692 (2020)
Luis Avilés-Félix is a researcher of the National Council for Scientific and Technical Research (CONICET) from Argentina. He develops his research activities at the Magnetic Resonance Laboratory in the Physics Deparment of the Centro Atómico Bariloche. He received his degree in Physics in 2010 from the Science’s Faculty of National University of Engineering in Lima, Perú. In 2011 he moved to Argentina and obtained his Ph.D. in Physics in 2015 from Instituto Balseiro/Cuyo’s National University with a fellowship sponsored by CONICET/Argentina. He obtained a postdoc at the Magnetic Resonance Laboratory of Centro Atómico Bariloche in Argentina between 2016-2018 and worked on the generation and detection of spin currents with synthetic antiferromagnets. He did a second postdoc at SPINTEC laboratory from Commissariat à l’énergie atomique et aux énergies alternatives (CEA) in Grenoble, France between 2018-2020 and worked on the development of optically-switchable synthetic ferrimagnetic materials and its integration in MTJ structures. His current research activities involves the study of spin dynamics in low dimensional systems.
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