4.8 Article

The Interaction between Surface Acoustic Waves and Spin Waves: The Role of Anisotropy and Spatial Profiles of the Modes

Journal

NANO LETTERS
Volume 21, Issue 2, Pages 946-951

Publisher

AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.0c03692

Keywords

spin waves; surface acoustic waves; magnetoelastic interaction; Brillouin light scattering; finite-element method; thin films

Funding

  1. National Science Centre, Poland [UMO-2020/36/T/ST3/00542]

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The interaction between different types of wave excitation in hybrid systems is usually anisotropic. The magnetoelastic coupling between surface acoustic waves and spin waves strongly depends on the direction of the external magnetic field. However, this study shows that even if the field orientation supports the coupling, the magnetoelastic interaction may be significantly reduced for surface acoustic waves with a specific profile in the direction normal to the surface at distances much smaller than the wavelength.
The interaction between different types of wave excitation in hybrid systems is usually anisotropic. Magnetoelastic coupling between surface acoustic waves and spin waves strongly depends on the direction of the external magnetic field. However, in the present study we observe that even if the orientation of the field is supportive for the coupling, the magnetoelastic interaction can be significantly reduced for surface acoustic waves with a particular profile in the direction normal to the surface at distances much smaller than the wavelength. We use Brillouin light scattering for the investigation of thermally excited phonons and magnons in a magnetostrictive CoFeB/Au multilayer deposited on a Si substrate. The experimental data are interpreted on the basis of a linearized model of interaction between surface acoustic waves and spin waves.

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