Nonreciprocal Magnetoacoustic Waves in Dipolar-Coupled Ferromagnetic Bilayers
Kuess M, Heigl M, Flacke L, Hoerner A, Weiler M, Wixforth A, Albrecht M (2021)
Publication Type: Journal article
Publication year: 2021
Journal
Book Volume: 15
Article Number: 034060
Journal Issue: 3
DOI: 10.1103/PhysRevApplied.15.034060
Abstract
We study the interaction of surface acoustic waves (SAWs) with spin waves (SWs) in a Co40Fe40B20/Au/Ni81Fe19 system composed of two ferromagnetic layers separated by a nonmagnetic Au spacer layer. Because of interlayer magnetic dipolar coupling between the two ferromagnetic layers, a symmetric and an antisymmetric SW mode form, which both show a highly nondegenerate dispersion relation for oppositely propagating SWs. Due to magnetoacoustic SAW-SW interaction, we observe highly nonreciprocal SAW transmission in the piezoelectric-ferromagnetic hybrid device. We experimentally and theoretically characterize the magnetoacoustic wave propagation as a function of frequency, wave vector, and external magnetic field magnitude and orientation. Additionally, we demonstrate that the nonreciprocal SW dispersion of a coupled magnetic bilayer is highly tuneable and not limited to ultrathin magnetic films, in contrast to the nonreciprocity induced by the interfacial Dzyaloshinskii-Moriya interaction. Therefore, magnetoacoustic coupling in ferromagnetic multilayers provides a promising route towards building efficient acoustic isolators.
Involved external institutions
Germany (DE)How to cite
APA:
Kuess, M., Heigl, M., Flacke, L., Hoerner, A., Weiler, M., Wixforth, A., & Albrecht, M. (2021). Nonreciprocal Magnetoacoustic Waves in Dipolar-Coupled Ferromagnetic Bilayers. Physical Review Applied, 15(3). https://doi.org/10.1103/PhysRevApplied.15.034060
MLA:
Kuess, M., et al. "Nonreciprocal Magnetoacoustic Waves in Dipolar-Coupled Ferromagnetic Bilayers." Physical Review Applied 15.3 (2021).
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