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Increased lifetime of metastable skyrmions by controlled doping.

Birch, M. T. and Takagi, R. and Seki, S. and Wilson, M. N. and Kagawa, F. and Štefančič, A. and Balakrishnan, G. and Fan, R. and Steadman, P. and Ottley, C. J. and Crisanti, M. and Cubitt, R. and Lancaster, T. and Tokura, Y. and Hatton, P. D. (2019) 'Increased lifetime of metastable skyrmions by controlled doping.', Physical review B., 100 (1). 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:Article
Full text:(VoR) Version of Record
First Live Deposit - 25 July 2019
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Status:Peer-reviewed
Publisher Web site:https://doi.org/10.1103/PhysRevB.100.014425
Publisher statement:Reprinted with permission from the American Physical Society: Birch, M. T., Takagi, R., Seki, S., Wilson, M. N., Kagawa, F., Štefančič, A., Balakrishnan, G., Fan, R., Steadman, P., Ottley, C. J., Crisanti, M., Cubitt, R., Lancaster, T., Tokura, Y. & Hatton, P. D. (2019). Increased lifetime of metastable skyrmions by controlled doping. Physical Review B 100(1): 014425 © 2019 by the American Physical Society. Readers may view, browse, and/or download material for temporary copying purposes only, provided these uses are for noncommercial personal purposes. Except as provided by law, this material may not be further reproduced, distributed, transmitted, modified, adapted, performed, displayed, published, or sold in whole or part, without prior written permission from the American Physical Society.
Record Created:25 Jul 2019 10:13
Last Modified:25 Jul 2019 12:20

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