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MA: Fachverband Magnetismus

MA 14: Magnetization Dynamics II

MA 14.5: Talk

Monday, March 14, 2011, 18:00–18:15, HSZ 403

Elastically driven ferromagnetic resonance in nickel thin films — Mathias Weiler¹, Lukas Dreher², Christian Heeg¹, Hans Huebl¹, Rudolf Gross¹, Martin S. Brandt², and •Sebastian T. B. Goennenwein¹ — ¹Walther-Meißner-Institut, Bayerische Akademie der Wissenschaften, Garching, Germany — ²Walter Schottky Institut, Technische Universität München, Garching, Germany

Because of magneto-elastic coupling, magnetic degrees of freedom are influenced by elastic deformation. We here demonstrate that the magneto-elastic interaction of a radio frequency (RF) surface acoustic wave (SAW) with a ferromagnetic thin film enables an all-elastic excitation and detection of ferromagnetic resonance (FMR) in nickel/lithium niobate hybrid devices. We have measured the SAW magneto-transmission in such samples at room temperature, as a function of microwave frequency, external magnetic field magnitude, and magnetic field orientation. Our data are consistently described by a modified Landau-Lifshitz-Gilbert approach [1], in which the magnetization precession is not driven by a conventional, external RF magnetic field, but rather by a purely virtual, internal tickle field stemming from RF magneto-elastic interactions. This causes a distinct magnetic field orientation dependence of elastically driven FMR, clearly observed in both simulation and experiment.

This work is financially supported by DFG via project GO 944/3-1, SFB 631, and the excellence cluster Nanosystems Initiative Munich.

[1] M. Weiler et al. arXiv:1009.5798