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MA: Fachverband Magnetismus

MA 52: Poster Magnetism III

MA 52.18: Poster

Donnerstag, 12. März 2026, 15:00–17:00, P4

Magnon-phonon coupling in suspended nanostructure — •Giovanni Del Bufalo^1,2, Matthias Grammer^1,2, Johannes Weber^1,2, and Hans Huebl^1,2,3 — 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

High-overtone bulk acoustic wave resonators were among the first mechanical systems explored in the quantum regime, enabling studies of vacuum fluctuations and non-classical states. Integrating magnetic thin films with these resonators creates hybrid magneto-phononic excitations through magnetoelastic coupling, allowing energy exchange between phonons and magnons. Beyond energy transfer, these hybrid modes can inherit angular momentum from their constituent excitations, raising a fundamental question: how is angular momentum transferred and shared between phonons and magnons in such systems? We address this by implementing a suspended silicon membrane as a bulk acoustic wave resonator, coupled to a 40nm Co₂₅Fe₇₅ metallic film. Using broadband ferromagnetic resonance spectroscopy at cryogenic temperatures, we quantify the magnon-phonon coupling strength and assess its implications for angular momentum transfer and magnetization damping. Our results highlight the potential of this device architecture for probing spin-mechanical interactions and advancing hybrid quantum systems that combine magnetic and mechanical degrees of freedom.

Keywords: magnon-phonon coupling; magnetoelasticity; suspended membranes