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

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....

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Autores principales:	P. Sethi, S. Krishnia, W. L. Gan, F. N. Kholid, F. N. Tan, R. Maddu, W. S. Lew
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2017
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/9531e73ea91d401f9db2db9d88f81038
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spelling	oai:doaj.org-article:9531e73ea91d401f9db2db9d88f810382021-12-02T16:06:35ZBi-directional high speed domain wall motion in perpendicular magnetic anisotropy Co/Pt double stack structures10.1038/s41598-017-05409-72045-2322https://doaj.org/article/9531e73ea91d401f9db2db9d88f810382017-07-01T00:00:00Zhttps://doi.org/10.1038/s41598-017-05409-7https://doaj.org/toc/2045-2322Abstract 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.P. SethiS. KrishniaW. L. GanF. N. KholidF. N. TanR. MadduW. S. LewNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 7, Iss 1, Pp 1-8 (2017)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q P. Sethi S. Krishnia W. L. Gan F. N. Kholid F. N. Tan R. Maddu W. S. Lew Bi-directional high speed domain wall motion in perpendicular magnetic anisotropy Co/Pt double stack structures
description	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.
format	article
author	P. Sethi S. Krishnia W. L. Gan F. N. Kholid F. N. Tan R. Maddu W. S. Lew
author_facet	P. Sethi S. Krishnia W. L. Gan F. N. Kholid F. N. Tan R. Maddu W. S. Lew
author_sort	P. Sethi
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
publisher	Nature Portfolio
publishDate	2017
url	https://doaj.org/article/9531e73ea91d401f9db2db9d88f81038
work_keys_str_mv	AT psethi bidirectionalhighspeeddomainwallmotioninperpendicularmagneticanisotropycoptdoublestackstructures AT skrishnia bidirectionalhighspeeddomainwallmotioninperpendicularmagneticanisotropycoptdoublestackstructures AT wlgan bidirectionalhighspeeddomainwallmotioninperpendicularmagneticanisotropycoptdoublestackstructures AT fnkholid bidirectionalhighspeeddomainwallmotioninperpendicularmagneticanisotropycoptdoublestackstructures AT fntan bidirectionalhighspeeddomainwallmotioninperpendicularmagneticanisotropycoptdoublestackstructures AT rmaddu bidirectionalhighspeeddomainwallmotioninperpendicularmagneticanisotropycoptdoublestackstructures AT wslew bidirectionalhighspeeddomainwallmotioninperpendicularmagneticanisotropycoptdoublestackstructures
_version_	1718384976208068608

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

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