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arXiv · 1906.05543

Magnetoelasticity of $\mathrm{Co_{25}}\mathrm{Fe_{75}}$ thin films

Daniel Schwienbacher·Matthias Pernpeintner·Lukas Liensberger·Eric R. J. Edwards·Hans T. Nembach·Justin M. Shaw·Mathias Weiler·Rudolf Gross·Hans Huebl
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Abstract

We investigate the magnetoelastic properties of $\mathrm{Co_{25}}\mathrm{Fe_{75}}$ and $\mathrm{Co_{10}}\mathrm{Fe_{90}}$ thin films by measuring the mechanical properties of a doubly clamped string resonator covered with multi-layer stacks containing these films. For the magnetostrictive constants we find $\lambda_{\mathrm{Co_{25}}\mathrm{Fe_{75}}}=(-20.68\pm0.25)\times10^{-6}$ and $\lambda_{\mathrm{Co_{10}}\mathrm{Fe_{90}}}=(-9.80\pm0.12)\times10^{-6}$ at room temperature. In stark contrast to the positive magnetostriction previously found in bulk CoFe crystals. $\mathrm{Co_{25}}\mathrm{Fe_{75}}$ thin films unite low damping and sizable magnetostriction and are thus a prime candidate for micromechanical magnonic applications, such as sensors and hybrid phonon-magnon systems.

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Daniel Schwienbacher, Matthias Pernpeintner, Lukas Liensberger, Eric R. J. Edwards, Hans T. Nembach, Justin M. Shaw, Mathias Weiler, Rudolf Gross, Hans Huebl. 2019-06-13. Magnetoelasticity of $\mathrm{Co_{25}}\mathrm{Fe_{75}}$ thin films. https://doi.org/10.1063/1.5116314

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