Chiral phonons and phononic birefringence in ferromagnetic metal-bulk acoustic resonator hybrids
Müller M, Weber J, Engelhardt F, Bittencourt VA, Luschmann T, Cherkasskii M, Opel M, Goennenwein ST, Viola Kusminskiy S, Geprägs S, Gross R, Althammer M, Huebl H (2024)
Publication Type: Journal article
Publication year: 2024
Journal
Book Volume: 109
Article Number: 024430
Journal Issue: 2
DOI: 10.1103/PhysRevB.109.024430
Abstract
Magnomechanical devices, in which magnetic excitations couple to mechanical vibrations, have been discussed as efficient and broadband microwave signal transducers in the classical and quantum limit. We experimentally investigate the resonant magnetoelastic coupling between the ferromagnetic resonance modes in metallic Co25Fe75 thin films, featuring ultralow magnetic damping as well as sizable magnetostriction, and standing transverse elastic phonon modes in sapphire, silicon, and gadolinium gallium garnet at cryogenic temperatures. For all substrates, we observe a coherent interaction between the acoustic and magnetic modes. We identify the phonon modes as transverse shear waves propagating with slightly different velocities (Δv/v≃10-5); i.e., all investigated substrates show potential for phononic birefringence as well as phonon-mediated angular momentum transport. Our magnon-phonon hybrid systems operate in a coupling regime analogous to the Purcell enhanced damping in cavity magnonics.
Involved external institutions
Walther-Meißner-Institut für Tieftemperaturforschung
Germany (DE)
Max-Planck-Institut für die Physik des Lichts (MPL) / Max Planck Institute for the Science of Light
Germany (DE)
Université de Strasbourg (UDS)
France (FR)
Rheinisch-Westfälische Technische Hochschule (RWTH) Aachen
Germany (DE)
Universität Konstanz
Germany (DE)
Germany (DE)
Max-Planck-Institut für die Physik des Lichts (MPL) / Max Planck Institute for the Science of Light
Germany (DE)
Université de Strasbourg (UDS)
France (FR)
Rheinisch-Westfälische Technische Hochschule (RWTH) Aachen
Germany (DE)
Universität Konstanz
Germany (DE)
How to cite
APA:
Müller, M., Weber, J., Engelhardt, F., Bittencourt, V.A., Luschmann, T., Cherkasskii, M.,... Huebl, H. (2024). Chiral phonons and phononic birefringence in ferromagnetic metal-bulk acoustic resonator hybrids. Physical Review B, 109(2). https://dx.doi.org/10.1103/PhysRevB.109.024430
MLA:
Müller, M., et al. "Chiral phonons and phononic birefringence in ferromagnetic metal-bulk acoustic resonator hybrids." Physical Review B 109.2 (2024).
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