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- W3137243545 abstract "We study the interaction of surface acoustic waves (SAWs) with spin waves (SWs) in a ${mathrm{Co}}_{40}{mathrm{Fe}}_{40}{mathrm{B}}_{20}$/$mathrm{Au}$/${mathrm{Ni}}_{81}{mathrm{Fe}}_{19}$ system composed of two ferromagnetic layers separated by a nonmagnetic $mathrm{Au}$ 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." @default.
- W3137243545 created "2021-03-29" @default.
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- W3137243545 date "2021-03-19" @default.
- W3137243545 modified "2023-10-16" @default.
- W3137243545 title "Nonreciprocal Magnetoacoustic Waves in Dipolar-Coupled Ferromagnetic Bilayers" @default.
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- W3137243545 doi "https://doi.org/10.1103/physrevapplied.15.034060" @default.
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