Spin-wave modes and their intense excitation effects in Skyrmion crystals

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Abstract

We theoretically study spin-wave modes and their intense excitations activated by microwave magnetic fields in the Skyrmion-crystal phase of insulating magnets by numerically analyzing a two-dimensional spin model using the Landau-Lifshitz-Gilbert equation. Two peaks of spin-wave resonances with frequencies of ∼1GHz are found for in-plane ac magnetic field where distribution of the out-of-plane spin components circulates around each Skyrmion core. Directions of the circulations are opposite between these two modes, and hence the spectra exhibit a salient dependence on the circular polarization of irradiating microwave. A breathing-type mode is also found for an out-of-plane ac magnetic field. By intensively exciting these collective modes, melting of the Skyrmion crystal accompanied by a redshift of the resonant frequency is achieved within nanoseconds.

Original languageEnglish
Article number017601
JournalPhysical Review Letters
Volume108
Issue number1
DOIs
Publication statusPublished - 2012 Jan 5
Externally publishedYes

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ASJC Scopus subject areas

  • Physics and Astronomy(all)

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