Stability and metastability of skyrmions in thin lamellae of Cu2OSeO3
Wilson, M.N.; Birch, M.T.; Štefančič, A.; Twitchett-Harrison, A.C.; Balakrishnan, G.; Hicken, T.J.; Fan, R.; Steadman, P.; Hatton, P.D.
Mr Thomas James Hicken email@example.com
PGR Student Doctor of Philosophy
Professor Peter Hatton firstname.lastname@example.org
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  or  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  sample, and symmetric for the  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.
Wilson, M., Birch, M., Štefančič, A., Twitchett-Harrison, A., Balakrishnan, G., Hicken, T., …Hatton, P. (2020). Stability and metastability of skyrmions in thin lamellae of Cu2OSeO3. Physical Review Research, 2(1), Article 013096. https://doi.org/10.1103/physrevresearch.2.013096
|Journal Article Type||Article|
|Online Publication Date||Jan 29, 2020|
|Publication Date||Jan 31, 2020|
|Deposit Date||Jan 30, 2020|
|Publicly Available Date||Jan 30, 2020|
|Journal||Physical Review Research|
|Publisher||American Physical Society|
|Peer Reviewed||Peer Reviewed|
Published Journal Article
Publisher Licence URL
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.
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