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arXiv · 2004.03535

Nonreciprocal Dzyaloshinskii-Moriya magnetoacoustic waves

Matthias Küß·Michael Heigl·Luis Flacke·Andreas Hörner·Mathias Weiler·Manfred Albrecht·Achim Wixforth
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Abstract

We study the interaction of surface acoustic waves with spin waves in ultra-thin CoFeB/Pt bilayers. Due to the interfacial Dzyaloshinskii-Moriya interaction (DMI), the spin wave dispersion is non-degenerate for oppositely propagating spin waves in CoFeB/Pt. In combination with the additional nonreciprocity of the magnetoacoustic coupling itself, highly nonreciprocal acoustic wave transmission through the magnetic film is observed. We systematically characterize the magnetoacoustic wave propagation in a thickness series of CoFeB($d$)/Pt samples as a function of magnetic field magnitude and direction, and at frequencies up to 7 GHz. We quantitatively model our results to extract the strength of the DMI and magnetoacoustic driving fields.

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Matthias Küß, Michael Heigl, Luis Flacke, Andreas Hörner, Mathias Weiler, Manfred Albrecht, Achim Wixforth. 2020-04-07. Nonreciprocal Dzyaloshinskii-Moriya magnetoacoustic waves. https://doi.org/10.1103/physrevlett.125.217203

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