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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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Autores principales: Krishnia, S., Sethi, P., Gan, W. L., Kholid, F. N., Purnama, I., Ramu, M., Herng, T. S., Ding, J., Lew, W. S.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group UK 2017
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5601456/
https://www.ncbi.nlm.nih.gov/pubmed/28916827
http://dx.doi.org/10.1038/s41598-017-11733-9
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author Krishnia, S.
Sethi, P.
Gan, W. L.
Kholid, F. N.
Purnama, I.
Ramu, M.
Herng, T. S.
Ding, J.
Lew, W. S.
author_facet Krishnia, S.
Sethi, P.
Gan, W. L.
Kholid, F. N.
Purnama, I.
Ramu, M.
Herng, T. S.
Ding, J.
Lew, W. S.
author_sort Krishnia, S.
collection PubMed
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.
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spelling pubmed-56014562017-09-20 Role of RKKY torque on domain wall motion in synthetic antiferromagnetic nanowires with opposite spin Hall angles Krishnia, S. Sethi, P. Gan, W. L. Kholid, F. N. Purnama, I. Ramu, M. Herng, T. S. Ding, J. Lew, W. S. Sci Rep Article 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. Nature Publishing Group UK 2017-09-15 /pmc/articles/PMC5601456/ /pubmed/28916827 http://dx.doi.org/10.1038/s41598-017-11733-9 Text en © The Author(s) 2017 Open Access 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/.
spellingShingle Article
Krishnia, S.
Sethi, P.
Gan, W. L.
Kholid, F. N.
Purnama, I.
Ramu, M.
Herng, T. S.
Ding, J.
Lew, W. S.
Role of RKKY torque on domain wall motion in synthetic antiferromagnetic nanowires with opposite spin Hall angles
title 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_short 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
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5601456/
https://www.ncbi.nlm.nih.gov/pubmed/28916827
http://dx.doi.org/10.1038/s41598-017-11733-9
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