Exotic Spin Excitations in a Polar Magnet VOSe2O5
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1.
University of Tokyo
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2.
California Institute of Technology
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3.
Waseda University
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.
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.
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Additional details
- Japan Society for the Promotion of Science
- 18H03685
- Japan Society for the Promotion of Science
- 20H00337
- Japan Society for the Promotion of Science
- 20H00349
- Japan Society for the Promotion of Science
- 21H04440
- Japan Society for the Promotion of Science
- 21H04990
- Japan Society for the Promotion of Science
- 21K13876
- Japan Society for the Promotion of Science
- 21K18595
- Japan Society for the Promotion of Science
- 22H04965
- Japan Society for the Promotion of Science
- 23H04522
- Japan Society for the Promotion of Science
- 23KJ0664
- Japan Society for the Promotion of Science
- 24H02235
- Japan Society for the Promotion of Science
- 24H02231
- Japan Society for the Promotion of Science
- 24K00579
- Japan Science and Technology Agency
- JPMJPR18L5
- Japan Science and Technology Agency
- JPMJPR20B4
- Japan Science and Technology Agency
- JPMJCR1874
- Japan Science and Technology Agency
- JPMJCR20T1
- Japan Science and Technology Agency
- JPMJCR23O4
- Japan Science and Technology Agency
- The University of Tokyo
- Asahi Glass (Japan)
- Murata (Japan)
- Foundation for Promotion of Material Science and Technology of Japan
- Waseda University
- 2024C-153
- Accepted
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2024-08-22Accepted
- Available
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2024-09-24Published online
- Publication Status
- Published