Tunable spin wave dynamics in two-dimensional Ni80Fe20 nanodot lattices by varying dot shape
We demonstrate tunable spin wave spectrum in two-dimensional Ni80Fe20 nanodot lattices by varying dot shape. A single collective mode in elliptical dot lattices transforms into three distinct modes for the half-elliptical, rectangular, and diamond dot lattices, albeit with different peak frequencies...
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Veröffentlicht in: | Applied physics letters 2014-07, Vol.105 (1) |
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Format: | Artikel |
Sprache: | eng |
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Zusammenfassung: | We demonstrate tunable spin wave spectrum in two-dimensional Ni80Fe20 nanodot lattices by varying dot shape. A single collective mode in elliptical dot lattices transforms into three distinct modes for the half-elliptical, rectangular, and diamond dot lattices, albeit with different peak frequencies and intensities. A drastic change is observed for the triangular dots, where eight modes covering a broad band are observed. Using micromagnetic simulations, we characterized the modes as different localized, extended, and quantized modes, whose frequencies and spatial profiles are determined by a combination of internal field profiles within the nanodots and the stray magnetic field within the lattice. |
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ISSN: | 0003-6951 1077-3118 |
DOI: | 10.1063/1.4890088 |