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arXiv · 2002.04284

Sub-micrometer near-field focusing of spin waves in ultrathin YIG films

B. Divinskiy·N. Thiery·L. Vila·O. Klein·N. Beaulieu·J. Ben Youssef·S. O. Demokritov·V. E. Demidov
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Abstract

We experimentally demonstrate tight focusing of a spin wave beam excited in extended nanometer-thick films of Yttrium Iron Garnet by a simple microscopic antenna functioning as a single-slit near-field lens. We show that the focal distance and the minimum transverse width of the focal spot can be controlled in a broad range by varying the frequency/wavelength of spin waves and the antenna geometry. The experimental data are in good agreement with the results of numerical simulations. Our findings provide a simple solution for implementation of magnonic nano-devices requiring local concentration of the spin-wave energy.

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B. Divinskiy, N. Thiery, L. Vila, O. Klein, N. Beaulieu, J. Ben Youssef, S. O. Demokritov, V. E. Demidov. 2020-02-11. Sub-micrometer near-field focusing of spin waves in ultrathin YIG films. https://doi.org/10.1063/1.5131689

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