TY - JOUR
T1 - Dynamical switching of magnetic topology in microwave-driven itinerant magnet
AU - Eto, Rintaro
AU - Mochizuki, Masahito
N1 - Funding Information:
This work is supported by Japan Society for the Promotion of Science KAKENHI (Grants No. 16H06345, No. 19H00864, No. 19K21858, and No. 20H00337), CREST, the Japan Science and Technology Agency (Grant No. JPMJCR20T1), a Research Grant in the Natural Sciences from the Mitsubishi Foundation, and a Waseda University Grant for Special Research Projects (Projects No. 2020C-269 and No. 2021C-566). A part of the numerical simulations was performed at the Supercomputer Center of the Institute for Solid State Physics in the University of Tokyo.
Funding Information:
Japan Society for the Promotion of Science Japan Science and Technology Agency Mitsubishi Foundation University of Tokyo Waseda University
Publisher Copyright:
©2021 American Physical Society
PY - 2021/9/1
Y1 - 2021/9/1
N2 - 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.
AB - 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.
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U2 - 10.1103/PhysRevB.104.104425
DO - 10.1103/PhysRevB.104.104425
M3 - Article
AN - SCOPUS:85115890419
SN - 2469-9950
VL - 104
JO - Physical Review B
JF - Physical Review B
IS - 10
M1 - 104425
ER -