Magnetoacoustic waves in a highly magnetostrictive FeGa thin film

Marc Rovirola, M. Waqas Khaliq, Blai Casals, Adrian Begué, Neven Biskup, Noelia Coton, Joan Manel Hernàndez, Miguel Angel Niño, Michael Foerster, Alberto Hernández-Mínguez, Rocío Ranchal, Marius V. Costache, Antoni García-Santiago, Ferran Macià
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Abstract

The interaction between surface acoustic waves and magnetization offers an efficient route for electrically controlling magnetic states. Here, we demonstrate the excitation of magnetoacoustic waves in galfenol, a highly magnetostrictive alloy made of iron (72%) and gallium (28%). We quantify the amplitude of the induced magnetization oscillations using magnetic imaging in an X-ray photoelectron microscope and estimate the dynamic magnetoelastic constants through micromagnetic simulations. Our findings demonstrate the potential of galfenol for magnonic applications and reveal that, despite strong magnetoelastic coupling, magnetic interactions and spin-wave dispersion relations significantly influence the overall amplitude of magnetoacoustic waves.
高磁致伸缩铁镓薄膜中的磁声波
表面声波与磁化之间的相互作用为电控磁态提供了一条有效途径。在这里,我们展示了在一种由铁(72%)和镓(28%)制成的高磁致伸缩性合金--galfenol 中激发磁声波的过程。我们利用 X 射线光电子显微镜的磁成像技术量化了诱导磁化振荡的振幅,并通过微磁模拟估算了动态磁弹性常数。我们的研究结果证明了镓酚在磁性应用方面的潜力,并揭示了尽管磁弹性耦合很强,但磁相互作用和自旋波色散关系对磁声波的整体振幅有很大影响。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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