SKM 2023 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 18: Functional Antiferromagnetism I

MA 18.1: Vortrag

Dienstag, 28. März 2023, 15:00–15:15, HSZ 02

Magnetization dynamics in hybrid Mn₂Au/Ni₈₀Fe₂₀ system — •Hassan Al-Hamdo¹, Tobias Wagner², Yaryna Lytvynenko², Gutenberg Kendzo¹, Sonka Reimers², Moritz Ruhwedel¹, Misbah Yaqoob¹, Philipp Pirro¹, Olena Gomonay², Vitaliy I. Vasyuchka¹, Mathias Kläui², Martin Jourdan², and Mathias Weiler¹ — ¹Fachbereich Physik and Landesforschungszentrum OPTIMAS, Rheinland-Pfälzische Technische Universität Kaiserslautern-Landau, 67663 Kaiserslautern, Germany — ²Institute of Physics, Johannes Gutenberg-University Mainz, 55099 Mainz, Germany

We study the magnetization dynamics of Mn₂Au/Ni₈₀Fe₂₀ thin film bilayers. This system allows us to control the Mn₂Au Néel vector orientation with moderate external magnetic fields [1].Furthermore, Mn₂Au enables current pulse induced switching of the Néel vector via Néel spin-orbit torques [2] making this system intriguing for antiferromagnetic spintronics. By varying the thickness of the ferromagnetic layer, we investigated the effect of strongly exchange coupled Mn₂Au/Ni₈₀Fe₂₀ interface on the spin dynamics. Broadband ferromagnetic resonance and Brillion light scattering experiments reveal that interfacial exchange coupling causes an increase in the resonance frequency of Ni₈₀Fe₂₀. Our theoretical model based on the modification of the spin-wave wavevector due to interfacial coupling yields good agreement with the experimental observations.

[1] Bommanaboyena et al., Nature Communications 12, 6539 (2021) [2] Y. Lytvynenko et al., arXiv:2208.04048v1 (2022).