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28 September 2023 Spin-Hall transport and spin-orbit torque from first principles: from single layers to trilayers
Kirill D. Belashchenko, Giovanni G. Baez Flores, Wuzhang Fang, Alexey A. Kovalev, Vivek P. Amin, Paul M. Haney, Mark D. Stiles
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Proceedings Volume PC12656, Spintronics XVI; PC126560U (2023) https://doi.org/10.1117/12.2676090
Event: SPIE Nanoscience + Engineering, 2023, San Diego, California, United States
Abstract
We will discuss first-principles calculations of spin transport and spin-orbit torques in disordered films and multilayers within the nonequilibrium Green's function technique. For a nonmagnetic Pt film, the behavior of the spin accumulation and the transverse spin current deviate significantly from the conventional spin-diffusion model. The effective transverse spin-diffusion length is much shorter than the longitudinal spin-diffusion length. For ferromagnetic trilayers, we find dampinglike and fieldlike torques with unconventional spin polarizations. The large rotated fieldlike component in Co/Cu/Co trilayers is inconsistent with diffusive transport in the spacer layer but can be explained by nonlocal interactions between the ferromagnetic layers when the mean-free path is not small compared to the spacer thickness.
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Kirill D. Belashchenko, Giovanni G. Baez Flores, Wuzhang Fang, Alexey A. Kovalev, Vivek P. Amin, Paul M. Haney, and Mark D. Stiles "Spin-Hall transport and spin-orbit torque from first principles: from single layers to trilayers", Proc. SPIE PC12656, Spintronics XVI, PC126560U (28 September 2023); https://doi.org/10.1117/12.2676090
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KEYWORDS
Ferromagnetics
Boundary conditions
Copper
Diseases and disorders
Multilayers
Platinum
Spin polarization
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