Dynamical switching of magnetic topology in microwave-driven itinerant magnet

Rintaro Eto, Masahito Mochizuki

研究成果: Article査読

5 被引用数 (Scopus)

抄録

We theoretically demonstrate microwave-induced dynamical switching of magnetic topology in centrosymmetric itinerant magnets by taking the Kondo-lattice model on a triangular lattice, which is known to exhibit two types of skyrmion lattices with different magnetic topological charges of and 2. Our numerical simulations reveal that intense excitation of a resonance mode with circularly polarized microwave field can switch the magnetic topology, i.e., from the skyrmion lattice with to another skyrmion lattice with or to a nontopological magnetic order with depending on the microwave frequency. This magnetic-topology switching shows various distinct behaviors, that is, deterministic irreversible switching, probabilistic irreversible switching, and temporally random fluctuation depending on the microwave frequency and the strength of the external magnetic field, the variety of which is attributable to different energy landscapes in the dynamical regime. The obtained results are also discussed in light of time-evolution equations based on an effective model derived using perturbation expansions.

本文言語English
論文番号104425
ジャーナルPhysical Review B
104
10
DOI
出版ステータスPublished - 2021 9月 1

ASJC Scopus subject areas

  • 電子材料、光学材料、および磁性材料
  • 凝縮系物理学

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