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Title: Bi-directional high speed domain wall motion in perpendicular magnetic anisotropy Co/Pt double stack structures
Authors: Sethi, Pankaj
Krishnia, Sachin
Gan, Weiliang
Kholid, Farhan N.
Tan, Funan
Maddu, Ramu
Lew, Wen Siang
Keywords: Dzyloshinskii-Moriya Interaction
Perpendicular Magnetic Anisotropy
Issue Date: 2017
Source: Sethi, P., Krishnia, S., Gan, W., Kholid, F. N., Tan, F., Maddu, R., et al. (2017). Bi-directional high speed domain wall motion in perpendicular magnetic anisotropy Co/Pt double stack structures. Scientific Reports, 7(1), 4964-.
Series/Report no.: Scientific Reports
Abstract: We report bi-directional domain wall (DW) motion along and against current flow direction in Co/Pt double stack wires with Ta capping. The bi-directionality is achieved by application of hard-axis magnetic field favoring and opposing the Dzyloshinskii-Moriya interaction (DMI), respectively. The speed obtained is enhanced when the hard-axis field favors the DMI and is along the current flow direction. Co/Pt double stack is a modification proposed for the high spin-orbit torque strength Pt/Co/Ta stack, to improve its thermal stability and perpendicular magnetic anisotropy (PMA). The velocity obtained reduces with increase in Pt spacer thickness due to reduction in DMI and enhances on increasing the Ta capping thickness due to higher SOT strength. The velocity obtained is as high as 530 m/s at a reasonable current density of 1 × 1012 A/m2 for device applications. The low anisotropy of the device coupled with the application of hard-axis field aids the velocity enhancement by preventing Walker breakdown.
ISSN: 2045-2322
DOI: 10.1038/s41598-017-05409-7
Rights: © 2017 The Author(s). 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
Fulltext Permission: open
Fulltext Availability: With Fulltext
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