Bi-directional high speed domain wall motion in perpendicular magnetic anisotropy Co/Pt double stack structures

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 spee...

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Main Authors: Sethi, Pankaj, Krishnia, Sachin, Gan, Weiliang, Kholid, Farhan N., Tan, Funan, Maddu, Ramu, Lew, Wen Siang
Other Authors: School of Physical and Mathematical Sciences
Format: Article
Language:English
Published: 2018
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Online Access:https://hdl.handle.net/10356/89525
http://hdl.handle.net/10220/44979
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Institution: Nanyang Technological University
Language: English
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spelling sg-ntu-dr.10356-895252023-02-28T19:36:37Z Bi-directional high speed domain wall motion in perpendicular magnetic anisotropy Co/Pt double stack structures Sethi, Pankaj Krishnia, Sachin Gan, Weiliang Kholid, Farhan N. Tan, Funan Maddu, Ramu Lew, Wen Siang School of Physical and Mathematical Sciences Dzyloshinskii-Moriya Interaction Perpendicular Magnetic Anisotropy 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. NRF (Natl Research Foundation, S’pore) MOE (Min. of Education, S’pore) Published version 2018-06-06T08:39:42Z 2019-12-06T17:27:38Z 2018-06-06T08:39:42Z 2019-12-06T17:27:38Z 2017 Journal Article 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-. 2045-2322 https://hdl.handle.net/10356/89525 http://hdl.handle.net/10220/44979 10.1038/s41598-017-05409-7 en Scientific Reports © 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 http://creativecommons.org/licenses/by/4.0/. 8 p. application/pdf
institution Nanyang Technological University
building NTU Library
continent Asia
country Singapore
Singapore
content_provider NTU Library
collection DR-NTU
language English
topic Dzyloshinskii-Moriya Interaction
Perpendicular Magnetic Anisotropy
spellingShingle Dzyloshinskii-Moriya Interaction
Perpendicular Magnetic Anisotropy
Sethi, Pankaj
Krishnia, Sachin
Gan, Weiliang
Kholid, Farhan N.
Tan, Funan
Maddu, Ramu
Lew, Wen Siang
Bi-directional high speed domain wall motion in perpendicular magnetic anisotropy Co/Pt double stack structures
description 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.
author2 School of Physical and Mathematical Sciences
author_facet School of Physical and Mathematical Sciences
Sethi, Pankaj
Krishnia, Sachin
Gan, Weiliang
Kholid, Farhan N.
Tan, Funan
Maddu, Ramu
Lew, Wen Siang
format Article
author Sethi, Pankaj
Krishnia, Sachin
Gan, Weiliang
Kholid, Farhan N.
Tan, Funan
Maddu, Ramu
Lew, Wen Siang
author_sort Sethi, Pankaj
title Bi-directional high speed domain wall motion in perpendicular magnetic anisotropy Co/Pt double stack structures
title_short Bi-directional high speed domain wall motion in perpendicular magnetic anisotropy Co/Pt double stack structures
title_full Bi-directional high speed domain wall motion in perpendicular magnetic anisotropy Co/Pt double stack structures
title_fullStr Bi-directional high speed domain wall motion in perpendicular magnetic anisotropy Co/Pt double stack structures
title_full_unstemmed Bi-directional high speed domain wall motion in perpendicular magnetic anisotropy Co/Pt double stack structures
title_sort bi-directional high speed domain wall motion in perpendicular magnetic anisotropy co/pt double stack structures
publishDate 2018
url https://hdl.handle.net/10356/89525
http://hdl.handle.net/10220/44979
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