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Enhanced skyrmion metastability under applied strain in FeGe
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Littlehales, M. T., Turnbull, L. A., Wilson, M. N., Birch, M. T., Popescu, H., Jaouen, N., Verezhak, J. A. T., Balakrishnan, G. and Hatton, P. D. (2022) Enhanced skyrmion metastability under applied strain in FeGe. Physical Review B (Condensed Matter and Materials Physics), 106 (21). 214434. doi:10.1103/PhysRevB.106.214434 ISSN 1098-0121.
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Official URL: http://dx.doi.org/10.1103/PhysRevB.106.214434
Abstract
Mechanical straining of skyrmion hosting materials has previously demonstrated increased phase stability through the expansion of the skyrmion equilibrium pocket. Additionally, metastable skyrmions can be generated via rapid field cooling to form significant skyrmion populations at low temperatures. Using small-angle x-ray scattering and x-ray holographic imaging on a thermally strained 200-nm-thick FeGe lamella, we observe temperature-induced strain effects on the structure and metastability of the skyrmion lattice. We find that in this sample orientation (H || [-1 1 0]) with no strain, metastable skyrmions produced by field cooling through the equilibrium skyrmion pocket vanish from the sample upon dropping below the well-known helical reorientation temperature. However, when strain is applied along the [1 1 0] axis, and this procedure is repeated, a substantial volume fraction of metastable skyrmions persist upon cooling below this temperature down to 100 K. Additionally, we observe a large number of skyrmions retained after a complete magnetic field polarity reversal, implying that the metastable energy barrier protecting skyrmions from decay is enhanced.
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, Magnetic materials | ||||||||
Journal or Publication Title: | Physical Review B (Condensed Matter and Materials Physics) | ||||||||
Publisher: | American Physical Society | ||||||||
ISSN: | 1098-0121 | ||||||||
Official Date: | 26 December 2022 | ||||||||
Dates: |
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Volume: | 106 | ||||||||
Number: | 21 | ||||||||
Number of Pages: | 9 | ||||||||
Article Number: | 214434 | ||||||||
DOI: | 10.1103/PhysRevB.106.214434 | ||||||||
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: | 4 January 2023 | ||||||||
Date of first compliant Open Access: | 5 January 2023 | ||||||||
RIOXX Funder/Project Grant: |
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