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Direct observation of exchange anisotropy in the helimagnetic insulator Cu2OSeO3

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Title
Direct observation of exchange anisotropy in the helimagnetic insulator Cu2OSeO3
Author(s)
Baral, Priya R.; Oleg I. Utesov; Luo, Chen; Radu, Florin; Magrez, Arnaud; White, Jonathan S.; Ukleev, Victor
Publication Date
2023-08
Journal
Physical Review Research, v.5, no.3
Publisher
AMER PHYSICAL SOC
Abstract
The helical magnetic structures of cubic chiral systems are well explained by the competition among Heisenberg exchange, Dzyaloshinskii-Moriya interaction, cubic anisotropy, and anisotropic exchange interaction (AEI). Recently, the role of the latter has been argued theoretically to be crucial for the low-temperature phase diagram of the cubic chiral magnet Cu2OSeO3, which features tilted conical and disordered skyrmion states for a specific orientation of the applied magnetic field (μ0H - ∥[001]). In this study, we exploit transmission resonant x-ray scattering in vector magnetic fields to directly quantify the strength of the AEI in Cu2OSeO3 and measure its temperature dependence. We find that the AEI continuously increases below 50 K, resulting in a conical spiral pitch variation of 10% in the (001) plane. Our results contribute to establishing the interaction space that supports tilted cone and low-temperature skyrmion state formation, facilitating the goals for both a quantitative description and eventual design of the diverse spiral states existing amongst chiral magnets. © 2023 authors. Published by the American Physical Society. Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI.
URI
https://pr.ibs.re.kr/handle/8788114/14142
DOI
10.1103/PhysRevResearch.5.L032019
ISSN
2643-1564
Appears in Collections:
Center for Theoretical Physics of Complex Systems(복잡계 이론물리 연구단) > 1. Journal Papers (저널논문)
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