SKM 2023 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 22: Terahertz Spintronics
MA 22.3: Vortrag
Dienstag, 28. März 2023, 15:30–15:45, POT 6
Switching and excitation of THz spin waves in Mn2Au due to femtosecond spin-transfer torques — •Markus Weißenhofer1,2, Francesco Foggetti1, and Peter Oppeneer1 — 1Department of Physics and Astronomy, Uppsala University — 2Department of Physics, Free University Berlin
In trilayer spin valves consisting of Fe|Cu|Fe, ultrafast laser pulses can generate hot-electron spin currents that exert spin-transfer torques, which excite THz spin waves [1]. Here, we replace the second Fe layer by antiferromagnetic Mn2Au and demonstrate that spin waves with even higher frequencies can be excited. We compute the temporal evolution of the hot-electron spin currents by means of the superdiffusive transport model and simulate the response of the Mn2Au layer to the resulting femtosecond spin-transfer torque pulse using atomistic spin dynamics simulations. Our results reveal that - due to the small thickness of the Mn2Au layer and exchange enhancement - standing spin waves of up to several THz can be excited. Upon increasing the laser fluence, we even find that the excited spin-current pulses are sufficient to induce switching of Mn2Au layer, faster than the experimentally demonstrated electrically induced switching of Mn2Au [2].
[1] U. Ritzmann, P. Baláž, P. Maldonado, K. Carva, and P. M. Oppeneer, Phys. Rev. B 101, 174427 (2020).
[2] S. Y. Bodnar, L. Šmejkal, I. Turek, T. Jungwirth, O. Gomonay, J. Sinova, A. A. Sapozhnik, H.-J. Elmers, M. Kläui, and M. Jourdan, Nature Communications 9, 348 (2018).