SKM 2021 – scientific programme
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MA: Fachverband Magnetismus
MA 11: Posters Magnetism III
MA 11.3: Poster
Wednesday, September 29, 2021, 13:30–16:30, P
Magnetization Dynamics in Hybrid Ferromagnetic Systems — •Misbah Yaqoob1,2,3, Lukas Liensberger1,2, Luis Flake1,2, David Weffling3, Vitaliy Vasyuchka3, Matthias Althammer1,2, Rudolf Gross1,2, and Mathias Weiler1,3 — 1Walther-Meißner-Institut, Garching, Germany — 2Physik- Department, TU München, Germany — 3Fachbereich Physik, TU Kaiserslautern, Germany
Thin film heterostructures consisting of several magnetically ordered layers are a promising platform for magnon spintronics because they can host complex magnetic textures, hybrid spin dynamics and spin torques [1,2].
We have investigated the magnetization dynamics of purely metallic ferromagnetic thin film multilayers and insulating magnet/metallic magnet thin film hybrid systems using broadband ferromagnetic resonance (FMR) and microfocused frequency-resolved magneto-optic Kerr effect (µFR-MOKE) at room temperature. With FMR, we find that the anisotropy of all-metallic systems can be tuned from µ0Meff ≈ 300 mT to µ0Meff ≈ 0 by varying the number of multilayer repeats without affecting magnetic damping. We extract the spinwave dispersion using µFR-MOKE and find µm scale spinwave propagation lengths and group velocities in the order of 10 km/s. We compare these findings to those obtained in hybrid metallic ferromagnet/insulating yttrium iron garnet thin film heterostructures.
[1] Klingler et al. Phys. Rev. Lett. 120, 127201 (2018)
[2]Flacke et al. arXiv:2102.11117 (2021)