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Exotic Spin Excitations in a Polar Magnet VOSe2O5

Tomonao Araki1,*, Rina Takagi1,2,‡, Takashi Kurumaji3, Yoshinori Tokura1,4,5, Masahito Mochizuki6, and Shinichiro Seki1,2,†

  • *Contact author: araki@topo.t.u-tokyo.ac.jp
  • †Contact author: seki@ap.t.u-tokyo.ac.jp
  • ‡Present address: The Institute for Solid State Physics, University of Tokyo, Kashiwa 277-8581, Japan.
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Phys. Rev. Lett. 133, 136702 – Published 24 September, 2024

DOI: https://doi.org/10.1103/PhysRevLett.133.136702

Abstract

Magnetic resonance dynamics has been studied for a polar magnet VOSe2O5, which hosts several nontrivial magnetic phases including Néel-type skyrmion lattice (SkL). In both cycloidal and SkL spin states, two excitation modes active to oscillating magnetic field Bν⊥c and one mode active to Bν∥c are identified. The subsequent micromagnetic simulations well reproduce the observed selection rules and relative resonance frequencies, which allows the unambiguous assignment of the spin oscillation manner for each mode. Interestingly, the IC-2 phase with a potential double-q character was found to host similar excitation modes as the SkL state. We also discovered the existence of the novel B’ phase with four modes active to Bν⊥c. The present results provide a fundamental basis for the comprehensive understanding of resonant spin dynamics in polar magnets, and highlight VOSe2O5 as a unique material platform to host a rich variety of nontrivial spin excitations.

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Phys. Rev. Lett. 133, 136702– Published 24 September, 2024
  • Received 14 May 2024
  • Revised 18 July 2024
  • Accepted 22 August 2024
Article part of CHORUS
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