Influence of intermixing at the Ta/CoFeB interface on spin Hall angle in Ta/CoFeB/MgO heterostructures

Abstract When a current is passed through a non-magnetic metal with strong spin-orbit coupling, an orthogonal spin current is generated. This spin current can be used to switch the magnetization of an adjacent ferromagnetic layer or drive its magnetization into continuous precession. The interface,...

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Autores principales:	Monika Cecot, Łukasz Karwacki, Witold Skowroński, Jarosław Kanak, Jerzy Wrona, Antoni Żywczak, Lide Yao, Sebastiaan van Dijken, Józef Barnaś, Tomasz Stobiecki
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2017
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/53610b4da3d14051b8d49e4c7c047122
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spelling	oai:doaj.org-article:53610b4da3d14051b8d49e4c7c0471222021-12-02T11:40:14ZInfluence of intermixing at the Ta/CoFeB interface on spin Hall angle in Ta/CoFeB/MgO heterostructures10.1038/s41598-017-00994-z2045-2322https://doaj.org/article/53610b4da3d14051b8d49e4c7c0471222017-04-01T00:00:00Zhttps://doi.org/10.1038/s41598-017-00994-zhttps://doaj.org/toc/2045-2322Abstract When a current is passed through a non-magnetic metal with strong spin-orbit coupling, an orthogonal spin current is generated. This spin current can be used to switch the magnetization of an adjacent ferromagnetic layer or drive its magnetization into continuous precession. The interface, which is not necessarily sharp, and the crystallographic structure of the nonmagnetic metal can both affect the strength of current-induced spin-orbit torques. Here, we investigate the effects of interface intermixing and film microstructure on spin-orbit torques in perpendicularly magnetized Ta/Co40Fe40B20/MgO trilayers with different Ta layer thickness (5 nm, 10 nm, 15 nm), greater than the spin diffusion length. Effective spin-orbit torques are determined from harmonic Hall voltage measurements performed at temperatures ranging from 20 K to 300 K. We account for the temperature dependence of damping-like and field-like torques by including an additional contribution from the Ta/CoFeB interface in the spin diffusion model. Using this approach, the temperature variations of the spin Hall angle in the Ta underlayer and at the Ta/CoFeB interface are determined separately. Our results indicate an almost temperature-independent spin Hall angle of $${{\boldsymbol{\theta }}}_{{\boldsymbol{SH}}}^{{\boldsymbol{N}}}\approx -{\bf{0.2}}$$ θSHN≈−0.2 in Ta and a strongly temperature-dependent $${{\boldsymbol{\theta }}}_{{\boldsymbol{SH}}}^{{\boldsymbol{N}}}$$ θSHN for the intermixed Ta/CoFeB interface.Monika CecotŁukasz KarwackiWitold SkowrońskiJarosław KanakJerzy WronaAntoni ŻywczakLide YaoSebastiaan van DijkenJózef BarnaśTomasz StobieckiNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 7, Iss 1, Pp 1-11 (2017)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Monika Cecot Łukasz Karwacki Witold Skowroński Jarosław Kanak Jerzy Wrona Antoni Żywczak Lide Yao Sebastiaan van Dijken Józef Barnaś Tomasz Stobiecki Influence of intermixing at the Ta/CoFeB interface on spin Hall angle in Ta/CoFeB/MgO heterostructures
description	Abstract When a current is passed through a non-magnetic metal with strong spin-orbit coupling, an orthogonal spin current is generated. This spin current can be used to switch the magnetization of an adjacent ferromagnetic layer or drive its magnetization into continuous precession. The interface, which is not necessarily sharp, and the crystallographic structure of the nonmagnetic metal can both affect the strength of current-induced spin-orbit torques. Here, we investigate the effects of interface intermixing and film microstructure on spin-orbit torques in perpendicularly magnetized Ta/Co40Fe40B20/MgO trilayers with different Ta layer thickness (5 nm, 10 nm, 15 nm), greater than the spin diffusion length. Effective spin-orbit torques are determined from harmonic Hall voltage measurements performed at temperatures ranging from 20 K to 300 K. We account for the temperature dependence of damping-like and field-like torques by including an additional contribution from the Ta/CoFeB interface in the spin diffusion model. Using this approach, the temperature variations of the spin Hall angle in the Ta underlayer and at the Ta/CoFeB interface are determined separately. Our results indicate an almost temperature-independent spin Hall angle of $${{\boldsymbol{\theta }}}_{{\boldsymbol{SH}}}^{{\boldsymbol{N}}}\approx -{\bf{0.2}}$$ θSHN≈−0.2 in Ta and a strongly temperature-dependent $${{\boldsymbol{\theta }}}_{{\boldsymbol{SH}}}^{{\boldsymbol{N}}}$$ θSHN for the intermixed Ta/CoFeB interface.
format	article
author	Monika Cecot Łukasz Karwacki Witold Skowroński Jarosław Kanak Jerzy Wrona Antoni Żywczak Lide Yao Sebastiaan van Dijken Józef Barnaś Tomasz Stobiecki
author_facet	Monika Cecot Łukasz Karwacki Witold Skowroński Jarosław Kanak Jerzy Wrona Antoni Żywczak Lide Yao Sebastiaan van Dijken Józef Barnaś Tomasz Stobiecki
author_sort	Monika Cecot
title	Influence of intermixing at the Ta/CoFeB interface on spin Hall angle in Ta/CoFeB/MgO heterostructures
title_short	Influence of intermixing at the Ta/CoFeB interface on spin Hall angle in Ta/CoFeB/MgO heterostructures
title_full	Influence of intermixing at the Ta/CoFeB interface on spin Hall angle in Ta/CoFeB/MgO heterostructures
title_fullStr	Influence of intermixing at the Ta/CoFeB interface on spin Hall angle in Ta/CoFeB/MgO heterostructures
title_full_unstemmed	Influence of intermixing at the Ta/CoFeB interface on spin Hall angle in Ta/CoFeB/MgO heterostructures
title_sort	influence of intermixing at the ta/cofeb interface on spin hall angle in ta/cofeb/mgo heterostructures
publisher	Nature Portfolio
publishDate	2017
url	https://doaj.org/article/53610b4da3d14051b8d49e4c7c047122
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Influence of intermixing at the Ta/CoFeB interface on spin Hall angle in Ta/CoFeB/MgO heterostructures

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