SKM 2021 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 15: Posters Magnetism IV
MA 15.10: Poster
Donnerstag, 30. September 2021, 13:30–16:30, P
Dispersion relation of nutation surface spin waves in ferromagnets — •Mikhail Cherkasskii1, Michael Farle1,2, and Anna Semisalova1 — 1Faculty of Physics, University of Duisburg-Essen, Duisburg, 47057, Germany — 2Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Russia
Recently, it has been theoretically and experimentally demonstrated that the effects of inertia of magnetization should be considered in the full description of spin dynamics at pico- and femtosecond timescales [1-4]. The nutation motion of magnetization is a manifestation of inertia of the magnetic moments. A rigorous derivation including inertia in the Landau-Lifshitz-Gilbert equation was carried out by Mondal et al. in the Dirac-Kohn-Sham framework [3]. In this presentation, we show that inertia effect in magnetization dynamics results in a new type of spin waves, i.e. nutation surface spin waves, which propagate at terahertz frequencies in in-plane magnetized ferromagnetic thin films. Considering the magnetostatic limit, i.e. neglecting exchange coupling, we calculate dispersion relation and group velocity, which we find to be slower than the velocity of conventional (precession) spin waves. In addition, we find that the nutation surface spin waves are backward spin waves [1].
[1]*M. Cherkasskii, M. Farle, and A. Semisalova, Phys. Rev. B 103, 174435 (2021). [2]*M. Cherkasskii, M. Farle, and A. Semisalova, Phys. Rev. B 102, 184432 (2020). [3]*R. Mondal, M. Berritta, A. K. Nandy, and P. M. Oppeneer, Phys. Rev. B 96, 024425 (2017). [4]*K. Neeraj et al, Nat. Phys. 17, 245 (2021).