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Stability and metastability of skyrmions in thin lamellae of Cu2OSeO3
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Wilson, M. N., Birch, M. T., Štefančič, Aleš, Twitchett-Harrison, A. C., Balakrishnan, G., Hicken, T. J., Fan, R., Steadman, P. and Hatton, P. D. (2020) Stability and metastability of skyrmions in thin lamellae of Cu2OSeO3. Physical Review Research, 2 (1). 013096. doi:10.1103/PhysRevResearch.2.013096 ISSN 2643-1564.
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Official URL: http://dx.doi.org/10.1103/PhysRevResearch.2.013096
Abstract
We report small-angle x-ray scattering measurements of the skyrmion lattice in two 200-nm-thick Cu2OSeO3 lamellae aligned with the applied magnetic field parallel to the out of plane [110] or [100] crystallographic directions. Our measurements show that the equilibrium skyrmion phase in both samples is expanded significantly compared to bulk crystals, existing between approximately 30 and 50 K over a wide region of magnetic field. This skyrmion state is elliptically distorted at low fields for the [110] sample, and symmetric for the [100] sample, possibly due to crystalline anisotropy becoming more important at this sample thickness than it is in bulk samples. Furthermore, we find that a metastable skyrmion state can be observed at low temperature by field cooling through the equilibrium skyrmion pocket in both samples. In contrast to the behavior in bulk samples, the volume fraction of metastable skyrmions does not significantly depend on cooling rate. We show that a possible explanation for this is the change in the lowest temperature of the skyrmion state in this lamellae compared to bulk, without requiring different energetics of the skyrmion state.
Item Type: | Journal Article | |||||||||
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Subjects: | Q Science > QC Physics | |||||||||
Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | |||||||||
Library of Congress Subject Headings (LCSH): | Skyrme model, Condensed matter -- Magnetic properties | |||||||||
Journal or Publication Title: | Physical Review Research | |||||||||
Publisher: | American Physical Society | |||||||||
ISSN: | 2643-1564 | |||||||||
Official Date: | 29 January 2020 | |||||||||
Dates: |
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Volume: | 2 | |||||||||
Number: | 1 | |||||||||
Article Number: | 013096 | |||||||||
DOI: | 10.1103/PhysRevResearch.2.013096 | |||||||||
Status: | Peer Reviewed | |||||||||
Publication Status: | Published | |||||||||
Access rights to Published version: | Restricted or Subscription Access | |||||||||
Copyright Holders: | American Physical Society | |||||||||
Date of first compliant deposit: | 3 February 2020 | |||||||||
Date of first compliant Open Access: | 13 February 2020 | |||||||||
RIOXX Funder/Project Grant: |
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