Babu Nandan K P, Trzaskowska Aleksandra, Graczyk Piotr, Centała Grzegorz, Mieszczak Szymon, Głowiński Hubert, Zdunek Miłosz, Mielcarek Sławomir, Kłos Jarosław W
Faculty of Physics, Adam Mickiewicz University, Poznań, Poland.
Institute of Molecular Physics, Polish Academy of Sciences, Poznań, Poland.
Nano Lett. 2021 Jan 27;21(2):946-951. doi: 10.1021/acs.nanolett.0c03692. Epub 2020 Nov 24.
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.
混合系统中不同类型波激发之间的相互作用通常是各向异性的。表面声波与自旋波之间的磁弹性耦合强烈依赖于外部磁场的方向。然而，在本研究中我们观察到，即使磁场方向有利于耦合，对于在垂直于表面方向上具有特定轮廓且距离远小于波长的表面声波，磁弹性相互作用也可能会显著降低。我们使用布里渊光散射来研究沉积在硅衬底上的磁致伸缩CoFeB/Au多层膜中热激发的声子和磁振子。实验数据是基于表面声波与自旋波相互作用的线性化模型来解释的。
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