Role of RKKY torque on domain wall motion in synthetic antiferromagnetic nanowires with opposite spin Hall angles

We experimentally show the effect of enhanced spin-orbit and RKKY induced torques on the current-induced motion of a pair of domain walls (DWs), which are coupled antiferromagnetically in synthetic antiferromagnetic (SAF) nanowires. The torque from the spin Hall effect (SHE) rotates the Néel DWs pai...

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Main Authors: Krishnia, Sachin, Sethi, Pankaj, Gan, Wei Liang, Kholid, Farhan Nur, Purnama, Indra, Ramu, Maddu, Herng, Tun Seng, Ding, Jun, 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/10356/88256
http://hdl.handle.net/10220/45662
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Institution: Nanyang Technological University
Language: English
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spelling sg-ntu-dr.10356-882562023-02-28T19:23:50Z Role of RKKY torque on domain wall motion in synthetic antiferromagnetic nanowires with opposite spin Hall angles Krishnia, Sachin Sethi, Pankaj Gan, Wei Liang Kholid, Farhan Nur Purnama, Indra Ramu, Maddu Herng, Tun Seng Ding, Jun Lew, Wen Siang School of Physical and Mathematical Sciences Synthetic Antiferromagnetic Hall Angle DRNTU::Science::Physics We experimentally show the effect of enhanced spin-orbit and RKKY induced torques on the current-induced motion of a pair of domain walls (DWs), which are coupled antiferromagnetically in synthetic antiferromagnetic (SAF) nanowires. The torque from the spin Hall effect (SHE) rotates the Néel DWs pair into the transverse direction, which is due to the fact that heavy metals of opposite spin Hall angles are deposited at the top and the bottom ferromagnetic interfaces. The rotation of both DWs in non-collinear fashion largely perturbs the antiferromagnetic coupling, which in turn stimulates an enhanced interlayer RKKY exchange torque that improved the DW velocity. The interplay between the SHE-induced torque and the RKKY exchange torque is validated via micromagnetic simulations. In addition, the DW velocity can be further improved by increasing the RKKY exchange strength. NRF (Natl Research Foundation, S’pore) MOE (Min. of Education, S’pore) Published version 2018-08-23T05:58:58Z 2019-12-06T16:59:13Z 2018-08-23T05:58:58Z 2019-12-06T16:59:13Z 2017 Journal Article Krishnia, S., Sethi, P., Gan, W. L., Kholid, F. N., Purnama, I., Ramu, M., . . . Lew, W. S. (2017). Role of RKKY torque on domain wall motion in synthetic antiferromagnetic nanowires with opposite spin Hall angles. Scientific Reports, 7, 11715-. doi:10.1038/s41598-017-11733-9 2045-2322 https://hdl.handle.net/10356/88256 http://hdl.handle.net/10220/45662 10.1038/s41598-017-11733-9 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. Te 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/. 11 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 Synthetic Antiferromagnetic
Hall Angle
DRNTU::Science::Physics
spellingShingle Synthetic Antiferromagnetic
Hall Angle
DRNTU::Science::Physics
Krishnia, Sachin
Sethi, Pankaj
Gan, Wei Liang
Kholid, Farhan Nur
Purnama, Indra
Ramu, Maddu
Herng, Tun Seng
Ding, Jun
Lew, Wen Siang
Role of RKKY torque on domain wall motion in synthetic antiferromagnetic nanowires with opposite spin Hall angles
description We experimentally show the effect of enhanced spin-orbit and RKKY induced torques on the current-induced motion of a pair of domain walls (DWs), which are coupled antiferromagnetically in synthetic antiferromagnetic (SAF) nanowires. The torque from the spin Hall effect (SHE) rotates the Néel DWs pair into the transverse direction, which is due to the fact that heavy metals of opposite spin Hall angles are deposited at the top and the bottom ferromagnetic interfaces. The rotation of both DWs in non-collinear fashion largely perturbs the antiferromagnetic coupling, which in turn stimulates an enhanced interlayer RKKY exchange torque that improved the DW velocity. The interplay between the SHE-induced torque and the RKKY exchange torque is validated via micromagnetic simulations. In addition, the DW velocity can be further improved by increasing the RKKY exchange strength.
author2 School of Physical and Mathematical Sciences
author_facet School of Physical and Mathematical Sciences
Krishnia, Sachin
Sethi, Pankaj
Gan, Wei Liang
Kholid, Farhan Nur
Purnama, Indra
Ramu, Maddu
Herng, Tun Seng
Ding, Jun
Lew, Wen Siang
format Article
author Krishnia, Sachin
Sethi, Pankaj
Gan, Wei Liang
Kholid, Farhan Nur
Purnama, Indra
Ramu, Maddu
Herng, Tun Seng
Ding, Jun
Lew, Wen Siang
author_sort Krishnia, Sachin
title Role of RKKY torque on domain wall motion in synthetic antiferromagnetic nanowires with opposite spin Hall angles
title_short Role of RKKY torque on domain wall motion in synthetic antiferromagnetic nanowires with opposite spin Hall angles
title_full Role of RKKY torque on domain wall motion in synthetic antiferromagnetic nanowires with opposite spin Hall angles
title_fullStr Role of RKKY torque on domain wall motion in synthetic antiferromagnetic nanowires with opposite spin Hall angles
title_full_unstemmed Role of RKKY torque on domain wall motion in synthetic antiferromagnetic nanowires with opposite spin Hall angles
title_sort role of rkky torque on domain wall motion in synthetic antiferromagnetic nanowires with opposite spin hall angles
publishDate 2018
url https://hdl.handle.net/10356/88256
http://hdl.handle.net/10220/45662
_version_ 1759855425774157824