Regensburg 2019 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 2: Ultrafast magnetization effects and magnetization dynamics

MA 2.6: Vortrag

Montag, 1. April 2019, 10:45–11:00, H37

Theory of ultrafast demagnetization in noncollinear spin valves — •Pavel Baláž1,2, Karel Carva1, Maciej Zwierzycki3, Dominik Legut2, Pablo Maldonado4, and Peter M. Oppeneer41Charles University, Faculty of Mathematics and Physics, Department of Condensed Matter Physics, Ke Karlovu 5, CZ 121 16 Prague, Czech Republic — 2IT4Innovations Center, VSB Technical University of Ostrava, 17. listopadu 15, CZ 708 33 Ostrava-Poruba, Czech Republic — 3Institute of Molecular Physics, Polish Academy of Sciences, Smoluchowskiego 17, 60-179 Poznań, Poland — 4Department of Physics and Astronomy, Uppsala University, Box 516, SE-75120 Uppsala, Sweden

When a sample made of conducting metal is exposed to a femtosecond laser pulse, ultrafast demagnetization of the sample can be observed. One of the possible mechanisms is superdiffusive spin-dependent transport [1] of hot electrons excited by laser from the localized d band to the s one above the Fermi level. Here, we generalize this model for the case of a magnetic multilayer with noncollinear magnetizations. The spin-dependent transport through the interfaces between the layers is described by energy-dependent reflections and transmissions taking into account spin mixing. It is shown that laser-induced demagnetization of the multilayer depends on the magnetic configuration. Moreover, the angular dependence of spin transfer torque [2] acting on the magnetizations is estimated. [1] M. Battiato, et al., Phys. Rev. Lett. 105, 027203 (2010). [2] P. Baláž et al., J. Phys.: Cond. Matter 30, 115801 (2018).

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