Published September 27, 2024 | Published
Journal Article Open

Exotic Spin Excitations in a Polar Magnet VOSe2O5

  • 1. ROR icon University of Tokyo
  • 2. ROR icon California Institute of Technology
  • 3. ROR icon Waseda University

Abstract

Magnetic resonance dynamics has been studied for a polar magnet VOSe2⁢O5, 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 VOSe2⁢O5 as a unique material platform to host a rich variety of nontrivial spin excitations.

Copyright and License

© 2024 American Physical Society

Acknowledgement

The authors thank A. Kikkawa and N. D. Khanh for enlightening discussions and experimental help. This work was partly supported by Grants-In-Aid for Scientific Research (Grants No. 18H03685, No. 20H00337, No. 20H00349, No. 21H04440, No. 21H04990, No. 21K13876, No. 21K18595, No. 22H04965, No. 23H04522, No. 23KJ0664, No. 24H02235, No. 24H02231, No. 24K00579) from JSPS, PRESTO (Grants No. JPMJPR18L5, No. JPMJPR20B4) and CREST (Grants No. JPMJCR1874, No. JPMJCR20T1, No. JPMJCR23O4) from JST, Katsu Research Encouragement Award and UTEC-UTokyo FSI Research Grant Program of the University of Tokyo, Asahi Glass Foundation, Murata Science Foundation and Foundation for Promotion of Material Science and Technology of Japan (MST Foundation). T. A. thanks the World-leading Innovative Graduate Study Program for Materials Research, Information, and Technology (MERIT-WINGS). M. M. thanks Waseda University Grant for Special Research Projects (Grant No. 2024C-153). This work was partly performed using the facilities of the Cryogenic Research Center, The University of Tokyo. The illustration of crystal structure was drawn by vesta [39].

Supplemental Material

Supplemental Material contains the detail of experimental methods, measured magnetic resonance spectra and theoretical simulations. Temperature dependence of magnetic resonance spectra is also provided as Supplemental Videos 1 and 2.

Files

PhysRevLett.133.136702.pdf
Files (12.7 MB)
Name Size Download all
md5:918871397a3db8d95c6ce9d48a22fe6b
5.4 MB Download
md5:65122b01f693215c4817676424d041a2
751.9 kB Preview Download
md5:7cf2e9168d4ea73ac8bc7e42bd2fc2f2
2.0 MB Preview Download
md5:b16b5407ffb309eb738e1e4ed81d1cc3
4.6 MB Download

Additional details

Created:
September 25, 2024
Modified:
September 25, 2024