Please use this identifier to cite or link to this item: https://hdl.handle.net/10356/87539
Title: Spin orbit torques induced magnetization reversal through asymmetric domain wall propagation in Ta/CoFeB/MgO structures
Authors: Cao, Jiangwei
Chen, Yifei
Jin, Tianli
Gan, Weiliang
Wang, Ying
Zheng, Yuqiang
Lv, Hua
Cardoso, Susana
Wei, Dan
Lew, Wen Siang
Keywords: Spin Orbit Torques
Magnetization Reversal
Issue Date: 2018
Source: Cao, J., Chen, Y., Jin, T., Gan, W., Wang, Y., Zheng, Y., et al. (2018). Spin orbit torques induced magnetization reversal through asymmetric domain wall propagation in Ta/CoFeB/MgO structures. Scientific Reports, 8(1), 1355-.
Series/Report no.: Scientific Reports
Abstract: The magnetization reversal induced by spin orbit torques in the presence of Dzyaloshinskii-Moriya interaction (DMI) in perpendicularly magnetized Ta/CoFeB/MgO structures were investigated by using a combination of Anomalous Hall effect measurement and Kerr effect microscopy techniques. By analyzing the in-plane field dependent spin torque efficiency measurements, an effective field value for the DMI of ~300 Oe was obtained, which plays a key role to stabilize Néel walls in the film stack. Kerr imaging reveals that the current-induced reversal under small and medium in-plane field was mediated by domain nucleation at the edge of the Hall bar, followed by asymmetric domain wall (DW) propagation. However, as the in-plane field strength increases, an isotropic DW expansion was observed before reaching complete reversal. Micromagnetic simulations of the DW structure in the CoFeB layer suggest that the DW configuration under the combined effect of the DMI and the external field is responsible for the various DW propagation behaviors.
URI: https://hdl.handle.net/10356/87539
http://hdl.handle.net/10220/45420
ISSN: 2045-2322
DOI: 10.1038/s41598-018-19927-5
Rights: © 2018 The Author(s) (Nature Publishing Group). This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:SPMS Journal Articles

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