Regensburg 2022 – scientific programme

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MA: Fachverband Magnetismus

MA 19: Poster 1

MA 19.59: Poster

Tuesday, September 6, 2022, 17:30–20:00, P2

Magnetization dynamics in hybrid ferromagnetic / antiferromagnetic systems — •Hassan Al-Hamdo¹, Yaryna Lytvynenko², Gutenberg Kendzo¹, Misbah Yaqoob¹, Moritz Ruhwedel¹, Philipp Pirro¹, Olena Gomonay², Vitaliy I. Vasyuchka¹, Mathias Kläui², Martin Jourdan², and Mathias Weiler¹ — ¹Fachbereich Physik and Landesforschungszentrum OPTIMAS, Technische Universität Kaiserslautern, 67663 Kaiserslautern, Germany — ²Institute of Physics, Johannes Gutenberg-University Mainz, 55128 Mainz, Germany

While typical antiferromagnetic magnons are in the THz range at zero external magnetic field, ferromagnetic magnons are gapless. A ferromagnet/antiferromagnet bilayer is thus expected to host hybrid spin excitations. 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]. Mn₂Au furthermore shows strong spin-orbit torque efficiency [2] making this system intriguing for all-electrical control of magnetization direction. By varying the thickness of Ni₈₀Fe₂₀, we investigated the effect of the Mn₂Au/Ni₈₀Fe₂₀ interface on Ni₈₀Fe₂₀ spin dynamics. Broadband ferromagnetic resonance and Brillion light scattering experiments reveal that interfacial exchange coupling causes an increase in the resonance frequency of Ni₈₀Fe₂₀.
Reference(s): [1] Bommanaboyena et al., Nature Communications 12, 6539 (2021) [2] Bodnar et al., Nature Communications 9, 348 (2018)