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MA: Fachverband Magnetismus
MA 2: Ultrafast Magnetization I
MA 2.2: Vortrag
Montag, 16. März 2020, 09:45–10:00, HSZ 101
Ultrafast spin momentum transfer in noncollinear spin valves — •Pavel Baláž1, Karel Carva1, Maciej Zwierzycki2, Pablo Maldonado3, and Peter M. Oppeneer3 — 1Charles University, Faculty of Mathematics and Physics, Department of Condensed Matter Physics, Ke Karlovu 5, CZ 121 16 Prague, Czech Republic — 2Institute of Molecular Physics, Polish Academy of Sciences, Smoluchowskiego 17, 60-179 Poznań, Poland — 3Department of Physics and Astronomy, Uppsala University, Box 516, SE-75120 Uppsala, Sweden
Ultrafast demagnetization of metallic thin films induced by a femtosecond laser pulse is a well-known phenomenon studied since 1996. One of the possible mechanisms is superdiffusive spin-dependent transport [1] of hot electrons excited by the pump laser from the localized d band to the sp one above the Fermi level. Here, we generalize this model for the case of a magnetic multilayer with noncollinear magnetizations [2]. The spin-dependent transport through the interfaces between the layers is described by energy-dependent reflections and transmissions calculated ab initio using the wave function matching method [3]. A substantial effect of spin filtering and of non-collinear magnetic configuration on ultrafast demagnetization and spin transfer torque is predicted for Al(3nm)/Ni(5nm)/Ru(2nm)/Fe(4nm)/Ru(5nm) spin valve. [1] M. Battiato et al., Phys. Rev. Lett. 105, 027203 (2010). [2] P. Baláž et al., J. Phys.: Cond. Matter 30, 115801 (2018). [3] M. Zwierzycki et al., Phys. Rev. B 71, 064420 (2005).