SKM 2023 – scientific programme
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MA: Fachverband Magnetismus
MA 40: Poster Magnetism II
MA 40.65: Poster
Thursday, March 30, 2023, 14:00–16:00, P2/EG
Tuning of magnetoelastic coupling with acoustic impedance matching techniques — •Johannes Weber1,2, Manuel Müller1,2, Stephan Geprägs1, Rudolf Gross1,2,3, Hans Huebl1,2,3, and Matthias Althammer1,2 — 1Walther-Meißner-Institut, Bayerische Akademie der Wissenschaften, Garching, Germany — 2TUM School of Natural Sciences, Technische Universität München, Garching, Germany — 3Munich Center for Quantum Science and Technology (MCQST), Munich, Germany
Magnetoelastic coupling and the coherent emission of phonon modes generated by magnon Kittel modes have regained interest because of their potential applications in quantum devices [1]. So far primarily the ferrimagnetic insulator yttrium iron garnet (YIG) grown on single crystal substrates of the paramagnetic insulator gadolinium gallium garnet (GGG) has been used in experiments. However, as YIG requires epitaxial growth, the choice of material combinations is limited. Therefore we studied magnon-phonon coupling in acoustic resonators consisting of polycrystalline magnetic thin-films grown on silicon substrates, as this material platform would allow for the implementation of magnetoelastic coupling effects in existing CMOS-technology. In particular, we investigate whether a tuning of the magnetoelastic coupling between magnetic metal thin films and silicon substrate can be achieved by inserting an intermediated metallic layer, allowing for better acoustic impedance matching [2].
[1] K. An et al., Phys. Rev. X 12, 011060, (2022).
[2] V. Rathod, Sensors, 20, 4051, (2020).