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

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 co...

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Veröffentlicht in:Applied physics letters 2020-02, Vol.116 (6)
Hauptverfasser: Divinskiy, B., Thiery, N., Vila, L., Klein, O., Beaulieu, N., Ben Youssef, J., Demokritov, S. O., Demidov, V. E.
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Sprache:eng
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Zusammenfassung: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 the implementation of magnonic nanodevices requiring a local concentration of the spin-wave energy.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.5131689