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Title: Electrical control of skyrmion density via skyrmion-stripe transformation
Authors: Ang, Calvin Ching Ian
Gan, Weiliang
Wong, Grayson Dao Hwee
Lew, Wen Siang
Keywords: Science::Physics
Issue Date: 2020
Source: Ang, C. C. I., Gan, W., Wong, G. D. H., & Lew, W. S. (2020). Electrical control of skyrmion density via skyrmion-stripe transformation. Physical Review Applied, 14(5), 054048-. doi:10.1103/physrevapplied.14.054048
Project: NRF-CRP9-2011- 01
NRF2015- IIP001-001
Journal: Physical Review Applied
Abstract: A comprehensive understanding of numerous electrical current-induced magnetic texture transformations is necessary to ensure the reliability of skyrmionic devices during operation. Here, we present an experimental study of unipolar current-induced skyrmion-stripe transformation in a Pt/Co/Fe/Ir magnetic bilayer. High current density pulses induce a densely packed skyrmion state, as commonly reported in many other studies, and skyrmion nucleation is expected to lessen with diminishing current density. However, at a lower current density where pinning effects become significant, a regime where current-induced skyrmion annihilation and skyrmion-to-stripe transformation is observed. Kerr imaging reveals that, under a low current pulse, the rapidly expanding stripes crowd out and annihilate the skyrmions before quickly decaying and leaving behind a sparse skyrmion population. Our findings establish an additional requirement of a minimum operating current density in the design of skyrmionic devices to avoid unintended skyrmion deletion. On the other hand, this skyrmion annihilation can also be strategically employed as a technique for skyrmion density control using solely current modulation in future skyrmionic devices.
ISSN: 2331-7019
DOI: 10.1103/PhysRevApplied.14.054048
Rights: © 2020 American Physical Society (APS). All rights reserved. This paper was published in Physical Review Applied and is made available with permission of American Physical Society (APS).
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:SPMS Journal Articles

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