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)
Hauptverfasser: Mahato, Bipul Kumar, Rana, Bivas, Kumar, Dheeraj, Barman, Saswati, Sugimoto, Satoshi, Otani, YoshiChika, Barman, Anjan
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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.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.4890088