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TT: Fachverband Tiefe Temperaturen

TT 84: Focus Session: Emerging Magnetic Phenomena from Chiral Phonons II (joint session MA/TT)

TT 84.2: Talk

Friday, March 22, 2024, 09:45–10:00, H 1058

Magnon-phonon coupling in Co₂₅Fe₇₅ thin film/crystalline substrate heterostructures — •J. Weber^1,2, M. Müller^1,2, F. Engelhardt^3,4,5, V. Bittencourt⁶, T. Luschmann^1,2,7, M. Cherkasskii⁵, S.T.B. Goennenwein⁸, S.V. Kusminskiy^5,3, S. Geprägs¹, R. Gross^1,2,7, M. Althammer^1,2, and H. Huebl^1,2,7 — ¹Walther-Meißner-Institut, Bayerische Akademie der Wissenschaften, Garching, Germany — ²School of Natural Sciences, Technical University of Munich, Garching, Germany — ³Max Planck Institute for the Science of Light, Erlangen, Germany — ⁴Department of Physics, University Erlangen-Nuremberg, Erlangen, Germany — ⁵Institute for Theoretical Solid State Physics, RWTH Aachen University, Aachen, Germany — ⁶ISIS (UMR 7006), Université de Strasbourg, Strasbourg, France — ⁷Munich Center for Quantum Science and Technology (MCQST), Munich, Germany — ⁸Department of Physics, University of Konstanz, Konstanz, Germany

The coupling between the quantized excitations of the spin system (magnons) and the lattice (phonons) regained interest due to potential applications in quantum devices. Here, we report the coherent excitation of elastic waves in a metallic ferromagnetic Co₂₅Fe₇₅ thin film by driving its Kittel modes, leading to the excitation of transverse acoustic phonons in the substrate forming a bulk acoustic wave resonator. Our results agree well with model calculations based on the magnetic and acoustic properties of the magnetic and elastic subsystems and allow to determine the effective magnetoelastic coupling strength.

Keywords: magnetoelastic