Spin-Wave Modes and Their Intense Excitation Effects in Skyrmion Crystals

Details Spin-Wave Modes and Their Intense Excitation Effects in Skyrmion Crystals Spin-Wave Modes and Their Intense Excitation Effects in Skyrmion Crystals

2011-11-24

arxiv.org/abs/1111.5667v1

Phys. Rev. Lett. 108, 017601 (2012)

Physics

Condensed Matter

Strongly Correlated Electrons

5 pages, 5 figures, accepted for publication in Physical Review Letters

Scientific paper

10.1103/PhysRevLett.108.017601

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 ~1 GHz are found for in-plane a.c. 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 salient dependence on the circular polarization of irradiating microwave. A breathing-type mode is also found for out-of-plane a.c. magnetic field. By intensively exciting these collective modes, melting of the skyrmion crystal accompanied by a red shift of the resonant frequency is achieved within nano seconds.

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