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MA: Fachverband Magnetismus
MA 64: Poster 1
MA 64.63: Poster
Freitag, 24. März 2017, 09:30–13:00, P2-EG
Surface acoustic wave devices for magnon-phonon interaction — •Clemens Mühlenhoff1,2, Stefan Klingler1,2, Hans Huebl1,2,3, Rudolf Gross1,2,3, and Mathias Weiler1,2 — 1Walther-Meißner-Institut, Bayerische Akademie der Wissenschaften, Garching, Germany — 2Physik-Department, Technische Universität München, Garching, Germany — 3Nanosystems Inititative Munich, München, Germany
Surface acoustic wave (SAW) delay line bandpass filters are of major importance in today’s communication technology. From a more fundamental perspective, SAWs represent coherent phonon states at GHz frequencies which can be employed to study the interplay of phonons with other degrees of freedom in a solid state environment. In particular, we are interested in the magnon-phonon interaction within a ferromagnetic thin film. We employ electron-beam lithography to define SAW delay lines on a LiNbO3 substrate. The interdigital transducers (IDTs) converting the electrical stimulus to a SAW are realized with metallic electrodes with a width of less than 1 µm. We present fabrication strategies and microwave transmission measurements to quantify the performance of our SAW delay lines. Our devices are capable of generating and detecting SAWs at frequencies exceeding 10 GHz. This frequency range is ideally suited for the study of phonon-driven magnetization dynamics in a ferromagnetic thin film deposited in the area between the two IDTs. This dynamics is induced by the resonant interaction of the coherent phonon drive and the magnons at the ferromagnetic resonance frequency.