Berlin 2018 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 11: Ultrafast magnetism II

MA 11.10: Vortrag

Montag, 12. März 2018, 17:30–17:45, EB 407

All Optical Switching in Ferromagnets: A Dynamical Model Study — •Christiane Scholl — University of Kaiserslautern

We present a microscopic calculation of the spin dynamics due to excitation with off-resonant and close-to-resonance circularly polarized optical fields in a mean-field ferromagnetic model system including spin-orbit-coupling, incoherent nonlinear effects and electronic redistribution processes.

Within the framework of the model, we calculate the evolution of the magnetization and show that, for certain excitation conditions, a polarization dependent switching of the magnetization occurs. In this talk, we clarify the respective contributions of the Inverse Faraday Effect [1,2] and the Spin-selective Optical Stark effect (spin-OSE) as introduced in [3]. We also discuss the effect of electronic heating and the role of off-resonant and nearly-resonant transitions.

[1] A. Kirilyuk, A. V. Kimel and T. Rasing, Rev. Mod. Phys. 82, 2731 (2010)

[2] M. Berritta, R. Mondal, K. Carva, P. M. Oppeneer, Phys. Rev. Lett. 117, 137203 (2016)

[3] A. Qaiumzadeh, G.E.W. Bauer and A. Brataas, Phys. Rev. B 88, 064416 (2013)