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Increased lifetime of metastable skyrmions by controlled doping
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Birch, M. T., Takagi, R., Seki, S., Wilson, M. N., Kagawa, F., Štefančič, Aleš, Balakrishnan, Geetha, Fay, R., Steadman, P., Ottley, C. J., Crisanti, Marta, Cubitt, R., Lancaster, T., Tokura, Y. and Hatton, P. D. (2019) Increased lifetime of metastable skyrmions by controlled doping. Physical Review B, 100 (1). 014425. doi:10.1103/PhysRevB.100.014425
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WRAP-increased-lifetime-metastable-skyrmions-doping-Crisanti-2019.pdf - Published Version - Requires a PDF viewer. Download (4088Kb) | Preview |
Official URL: http://dx.doi.org/10.1103/PhysRevB.100.014425
Abstract
Previous observations of metastable magnetic skyrmions have shown that close to the equilibrium pocket the metastable state has a short lifetime, and therefore, rapid cooling is required to generate a significant skyrmion population at low temperatures. Here, we report that the lifetime of metastable skyrmions in crystals of Cu2OSeO3 is extended by a factor of 50 with the introduction of only 2.5% zinc doping, allowing over 50% of the population to survive when field cooling at a rate of just 1 K/min. Our systematic study suggests that the lifetime enhancement is due to the increase in the pinning site density, rather than an alteration to the energy barrier of the decay process. We expect that doping can be exploited to control the lifetime of the metastable SkL state in other chiral magnets, offering a method of engineering skyrmion materials towards application in future devices.
| Item Type: | Journal Article | ||||||||||||||||||
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| Subjects: | Q Science > QC Physics | ||||||||||||||||||
| Divisions: | Faculty of Science > Physics | ||||||||||||||||||
| Library of Congress Subject Headings (LCSH): | Skyrme model, Magnetic materials | ||||||||||||||||||
| Journal or Publication Title: | Physical Review B | ||||||||||||||||||
| Publisher: | American Physical Society | ||||||||||||||||||
| ISSN: | 2469-9950 | ||||||||||||||||||
| Official Date: | 22 July 2019 | ||||||||||||||||||
| Dates: |
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| Volume: | 100 | ||||||||||||||||||
| Number: | 1 | ||||||||||||||||||
| Article Number: | 014425 | ||||||||||||||||||
| DOI: | 10.1103/PhysRevB.100.014425 | ||||||||||||||||||
| Status: | Peer Reviewed | ||||||||||||||||||
| Publication Status: | Published | ||||||||||||||||||
| Publisher Statement: | © 2019 American Physical Society | ||||||||||||||||||
| Access rights to Published version: | Restricted or Subscription Access | ||||||||||||||||||
| Copyright Holders: | © 2019 American Physical Society | ||||||||||||||||||
| Funder: | EPSRC Engineering and Physical Sciences Research Council | ||||||||||||||||||
| RIOXX Funder/Project Grant: |
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