Relaxation Dynamics of Zero-Field Skyrmions over a Wide Temperature Range

Date
2018-11-30
Authors
Peng, Licong
Zhang, Ying
Ke, Liqin
Kim, Tae-Hoon
Zheng, Qiang
Yan, Jiaqiang
Zhang, X.-G.
Gao, Yang
Wang, Shouguo
Cai, Jianwang
Shen, Baogen
McQueeney, Robert
Kaminski, Adam
Kramer, Matthew
Zhou, Lin
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Ames Laboratory
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Physics and Astronomy
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Abstract

The promise of magnetic skyrmions in future spintronic devices hinges on their topologically enhanced stability and the ability to be manipulated by external fields. The technological advantages of nonvolatile zero-field skyrmion lattice (SkL) are significant if their stability and reliability can be demonstrated over a broad temperature range. Here, we study the relaxation dynamics including the evolution and lifetime of zero-field skyrmions generated from field cooling (FC) in an FeGe single-crystal plate via in situ Lorentz transmission electron microscopy (L-TEM). Three types of dynamic switching between zero-field skyrmions and stripes are identified and distinguished. Moreover, the generation and annihilation of these metastable skyrmions can be tailored during and after FC by varying the magnetic fields and the temperature. This dynamic relaxation behavior under the external fields provides a new understanding of zero-field skyrmions for their stability and reliability in spintronic applications and also raises new questions for theoretical models of skyrmion systems.

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Relaxation dynamics, zero-field skyrmions, activation energy, field cooling (FC), L-TEM, FeGe
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