Bulletin of the American Physical Society
APS March Meeting 2023
Volume 68, Number 3
Las Vegas, Nevada (March 5-10)
Virtual (March 20-22); Time Zone: Pacific Time
Session LL04: V: Magnetic Nanostructures
5:00 AM–7:00 AM,
Tuesday, March 21, 2023
Room: Virtual Room 4
Sponsoring
Unit:
GMAG
Chair: Jack Gartside, Imperial College London
Abstract: LL04.00003 : Determination of perpendicular magnetic anisotropy in magnetic heterostructures: DFT-based spin-orbit torque method*
5:48 AM–6:00 AM
Presenter:
Yu-Hui Tang
(Department of Physics, National Central University, Taiwan)
Authors:
Yu-Hui Tang
(Department of Physics, National Central University, Taiwan)
Bao-Huei Huang
(Department of Physics, National Central University, Taiwan)
Yi-Feng Lai
(Department of Physics, National Central University, Taiwan)
An alternative solution is the so-called spin-orbit torque (SOT) method. In this study, the validity of our DFT-based self-developed JunPy [1,2] package with SOT calculation has been rigorously confirmed in three kinds of PMA systems, including iron thin films [3], Fe/MgO/Fe magnetic tunnel junction [4], and magnetic bilayers. Our results agree with the conventional MAE calculation but provide deeper insights into atomistic spin dynamics of local magnetic moments. The main advantage of this DFT+JunPy+SOT method is to provide the well-decomposed layer-resolved SOT and SOC-dominated spin current accumulation and the comprehensive physical understanding in angular momentum transfer between spin and orbital, competition between SOT and spin current accumulation, and precise spin torque acting on each local magnetic moment that is crucial for the atomistic spin dynamics especially in magnetic heterostructures.
*This work is supported by the National Science and Technology Council (MOST 108-2628-M-008-004-MY3 and 111-2112-M-008-025-). We thank to National Center for High-performance Computing (NCHC) of National Applied Research Laboratories (NARLabs) in Taiwan for providing computational and storage resources. We also thank to the National Center for Theoretical Sciences
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