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MA: Fachverband Magnetismus

MA 36: Terahertz Spintronics II

MA 36.1: Talk

Thursday, March 21, 2024, 09:30–09:45, EB 202

Simulating the THz response of Mn2Au — •Tobias Dannegger, Fynn Renner, and Ulrich Nowak — Fachbereich Physik, Universität Konstanz

The antiferromagnet Mn2Au is one of very few materials whose symmetry allows for Néel spin orbit torques, which can be used to excite its magnetic order on ultrafast timescales with the electric field of a THz pulse, as has recently been demonstrated [1]. Its perfectly uncompensated coupling to ferromagnetic permalloy is a promising option for detecting its magnetic state [2], while still allowing for ultrafast switching dynamics [3]. Here, we use atomistic spin dynamics simulations with ab initio calculated parameters [4] to understand the THz response of Mn2Au on a microscopic level and predict the conditions that allow for ultrafast THz-induced switching both in pure Mn2Au and in bilayers coupled to permalloy.

[1] Y. Behovits et al., Nat. Commun. 14, 6038 (2023).

[2] S. P. Bommanaboyena et al., Nat. Commun. 12, 6539 (2021).

[3] J. Hirst et al., Sci. Rep. 13, 12270 (2023).

[4] S. Selzer et al., Phys. Rev. B 105, 174416 (2022).

Keywords: Néel spin orbit torques; antiferromagnetic spintronics; Mn2Au; ultrafast switching