Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
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. Oppeneer4 — 1Charles 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).