Regensburg 2013 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 49: Magnetization Dynamics III of 3

MA 49.4: Vortrag

Freitag, 15. März 2013, 10:15–10:30, H22

Elastically driven ferromagnetic resonance in nickel thin films — •Matthias Pernpeintner¹, M. Weiler¹, L. Dreher², H. Huebl¹, R. Gross¹, M. S. Brandt², and S. T. B. Goennenwein¹ — ¹Walther-Meißner-Institut, Bayerische Akademie der Wissenschaften, Garching, Germany — ²Walter Schottky Institut, Technische Universität München, Garching, Germany

Recently, it has been shown that elastic strain induced by coherent phonons in a ferromagnet can be used to resonantly excite magnetization precession via magnetoelastic coupling [1,2]. In our experiments, we study hybrid structures consisting of a bulk LiNbO₃ crystal covered by a thin nickel film. A surface acoustic wave (SAW) propagating on the LiNbO₃ surface induces coherent phonons in the Ni film. The resulting magnetization dynamics are studied as a function of orientation and strength of an externally applied, static magnetic field. We present an analytical model as well as numerical calculations which quantitatively reproduce our experimental results. Furthermore, we analyse the effects of the SAW type on the magnetization dynamics. We also present recent experimental data obtained from a LiTaO₃/Ni hybrid structure, which supports both Rayleigh and shear-horizontal waves. Our results open the path for radio-frequency magnon-phonon coupling experiments, e.g., acoustic spin pumping. Financial support from the DFG via SPP 1538 SpinCAT and the Excellence Cluster Nanosystems Initiative Munich (NIM) is gratefully acknowledged.

[1] M. Weiler et al., Phys. Rev. Lett. 106, 117601 (2011)

[2] L. Dreher et al., Phys. Rev. B 86, 134415 (2012)