Nonreciprocal Dzyaloshinskii-Moriya magnetoacoustic waves

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

doi:10.1103/PhysRevLett.125.217203

Nonreciprocal Dzyaloshinskii-Moriya magnetoacoustic waves

Mesoscale and Nanoscale Physics 2020-12-03 v2 Materials Science

Authors: 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.

Keywords

surface acoustic waves spin waves Dzyaloshinskii-Moriya interaction nonreciprocity magnetoacoustic coupling CoFeB/Pt bilayers

Cite

@article{arxiv.2004.03535,
  title  = {Nonreciprocal Dzyaloshinskii-Moriya magnetoacoustic waves},
  author = {Matthias Küß and Michael Heigl and Luis Flacke and Andreas Hörner and Mathias Weiler and Manfred Albrecht and Achim Wixforth},
  journal= {arXiv preprint arXiv:2004.03535},
  year   = {2020}
}

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6 pages, 4 figures

Nonreciprocal Dzyaloshinskii-Moriya magnetoacoustic waves

Abstract

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