Theory of superdiffusive spin transport in noncollinear magnetic multilayers

0573075 - FZÚ 2024 RIV US eng J - Článek v odborném periodiku
Baláž, Pavel - Zwierzycki, M. - Cosco, F. - Carva, K. - Maldonado, P. - Oppeneer, P.M.
Theory of superdiffusive spin transport in noncollinear magnetic multilayers.
Physical Review B. Roč. 107, č. 17 (2023), č. článku 174418. ISSN 2469-9950. E-ISSN 2469-9969
Grant CEP: GA ČR GA19-13659S
Výzkumná infrastruktura: e-INFRA CZ - 90140
Institucionální podpora: RVO:68378271
Klíčová slova: magnetism * demagnetization * spin transfer torque
Obor OECD: Condensed matter physics (including formerly solid state physics, supercond.)
Impakt faktor: 3.7, rok: 2022
Způsob publikování: Omezený přístup
https://doi.org/10.1103/PhysRevB.107.174418

Ultrafast demagnetization induced by femtosecond laser pulses in thin metallic layers is caused by the outflow of spin-polarized hot-electron currents describable by the superdiffusive transport model. These laser-generated spin currents can cross the interface into another magnetic layer and give rise to magnetization dynamics in magnetic spin valves with noncollinear magnetizations. To describe ultrafast transport and spin dynamics in such nanostructures, we develop here the superdiffusive theory for general noncollinear magnetic multilayers. Specifically, we introduce an Al/Ni/Ru/Fe/Ru multilayer system with noncollinear Ni and Fe magnetic moments and analyze how the ultrafast demagnetization and spin-transfer torque depend on the noncollinearity. Spin-transfer torques on the Ni and Fe layers and the total spin momentum absorbed in the Ni and Fe layer are found to vary markedly with the amount of noncollinearity.
Trvalý link: https://hdl.handle.net/11104/0343609