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) |
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Format: | Artikel |
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. |
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ISSN: | 0003-6951 1077-3118 |
DOI: | 10.1063/1.5131689 |