Understanding the role of damping and Dzyaloshinskii-Moriya interaction on dynamic domain wall behaviour in platinum-ferromagnet nanowires

Abstract Heavy metal layers, exemplified by Pt, are known to play a significant role in the magnetization behaviour of thin-film ferromagnets by three distinct mechanisms that can each contribute to the reversal process. These include modifying the local magnetization state via an interfacial Dzyalo...

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Auteurs principaux:	J. Brandão, S. Azzawi, A. T. Hindmarch, D. Atkinson
Format:	article
Langue:	EN
Publié:	Nature Portfolio 2017
Sujets:	Medicine R Science Q
Accès en ligne:	https://doaj.org/article/112427dd216a4fa9b68c1d98cd7132d7
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spelling	oai:doaj.org-article:112427dd216a4fa9b68c1d98cd7132d72021-12-02T15:05:08ZUnderstanding the role of damping and Dzyaloshinskii-Moriya interaction on dynamic domain wall behaviour in platinum-ferromagnet nanowires10.1038/s41598-017-04088-82045-2322https://doaj.org/article/112427dd216a4fa9b68c1d98cd7132d72017-07-01T00:00:00Zhttps://doi.org/10.1038/s41598-017-04088-8https://doaj.org/toc/2045-2322Abstract Heavy metal layers, exemplified by Pt, are known to play a significant role in the magnetization behaviour of thin-film ferromagnets by three distinct mechanisms that can each contribute to the reversal process. These include modifying the local magnetization state via an interfacial Dzyaloshinskii-Moriya interaction (IDMI), enhancement of the damping, via d-d hybridisation and spin-pumping across the interface, and the mediation of the magnetization switching, with the flow of current through a system, via the spin-Hall effect. Here we show for a system with weak interfacial DMI (NiFe/Pt) that the measurement of magnetic field-driven magnetization reversal, mediated by domain wall (DW) motion, is dominated by the enhanced intrinsic damping contribution as a function of the Pt capping layer thickness. But, we also show micromagnetically that the IDMI and damping also combine to modify the domain wall velocity behaviour when the damping is larger. It is also noted that Walker breakdown occurs at lower fields and peak DW velocity decreases in the presence of IDMI. These results highlight the significance of the relative contributions of the damping and the IDMI from the heavy metal layer on the magnetization reversal and provide a route to controlling the DW behaviour in nanoscale device structures.J. BrandãoS. AzzawiA. T. HindmarchD. AtkinsonNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 7, Iss 1, Pp 1-10 (2017)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q J. Brandão S. Azzawi A. T. Hindmarch D. Atkinson Understanding the role of damping and Dzyaloshinskii-Moriya interaction on dynamic domain wall behaviour in platinum-ferromagnet nanowires
description	Abstract Heavy metal layers, exemplified by Pt, are known to play a significant role in the magnetization behaviour of thin-film ferromagnets by three distinct mechanisms that can each contribute to the reversal process. These include modifying the local magnetization state via an interfacial Dzyaloshinskii-Moriya interaction (IDMI), enhancement of the damping, via d-d hybridisation and spin-pumping across the interface, and the mediation of the magnetization switching, with the flow of current through a system, via the spin-Hall effect. Here we show for a system with weak interfacial DMI (NiFe/Pt) that the measurement of magnetic field-driven magnetization reversal, mediated by domain wall (DW) motion, is dominated by the enhanced intrinsic damping contribution as a function of the Pt capping layer thickness. But, we also show micromagnetically that the IDMI and damping also combine to modify the domain wall velocity behaviour when the damping is larger. It is also noted that Walker breakdown occurs at lower fields and peak DW velocity decreases in the presence of IDMI. These results highlight the significance of the relative contributions of the damping and the IDMI from the heavy metal layer on the magnetization reversal and provide a route to controlling the DW behaviour in nanoscale device structures.
format	article
author	J. Brandão S. Azzawi A. T. Hindmarch D. Atkinson
author_facet	J. Brandão S. Azzawi A. T. Hindmarch D. Atkinson
author_sort	J. Brandão
title	Understanding the role of damping and Dzyaloshinskii-Moriya interaction on dynamic domain wall behaviour in platinum-ferromagnet nanowires
title_short	Understanding the role of damping and Dzyaloshinskii-Moriya interaction on dynamic domain wall behaviour in platinum-ferromagnet nanowires
title_full	Understanding the role of damping and Dzyaloshinskii-Moriya interaction on dynamic domain wall behaviour in platinum-ferromagnet nanowires
title_fullStr	Understanding the role of damping and Dzyaloshinskii-Moriya interaction on dynamic domain wall behaviour in platinum-ferromagnet nanowires
title_full_unstemmed	Understanding the role of damping and Dzyaloshinskii-Moriya interaction on dynamic domain wall behaviour in platinum-ferromagnet nanowires
title_sort	understanding the role of damping and dzyaloshinskii-moriya interaction on dynamic domain wall behaviour in platinum-ferromagnet nanowires
publisher	Nature Portfolio
publishDate	2017
url	https://doaj.org/article/112427dd216a4fa9b68c1d98cd7132d7
work_keys_str_mv	AT jbrandao understandingtheroleofdampinganddzyaloshinskiimoriyainteractionondynamicdomainwallbehaviourinplatinumferromagnetnanowires AT sazzawi understandingtheroleofdampinganddzyaloshinskiimoriyainteractionondynamicdomainwallbehaviourinplatinumferromagnetnanowires AT athindmarch understandingtheroleofdampinganddzyaloshinskiimoriyainteractionondynamicdomainwallbehaviourinplatinumferromagnetnanowires AT datkinson understandingtheroleofdampinganddzyaloshinskiimoriyainteractionondynamicdomainwallbehaviourinplatinumferromagnetnanowires
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Understanding the role of damping and Dzyaloshinskii-Moriya interaction on dynamic domain wall behaviour in platinum-ferromagnet nanowires

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