Dresden 2026 – scientific programme
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MA: Fachverband Magnetismus
MA 52: Poster Magnetism III
MA 52.18: Poster
Thursday, March 12, 2026, 15:00–17:00, P4
Magnon-phonon coupling in suspended nanostructure — •Giovanni Del Bufalo1,2, Matthias Grammer1,2, Johannes Weber1,2, and Hans Huebl1,2,3 — 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