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

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dc.contributor Aalto-yliopisto fi
dc.contributor Aalto University en Cecot, Monika Karwacki, Łukasz Skowroński, Witold Kanak, Jarosław Wrona, Jerzy Zywczak, Antoni Yao, Lide van Dijken, Sebastiaan Barnaś, Józef Stobiecki, Tomasz 2017-05-31T06:04:07Z 2017-05-31T06:04:07Z 2017
dc.identifier.citation Cecot , M , Karwacki , Ł , Skowroński , W , Kanak , J , Wrona , J , Zywczak , A , Yao , L , van Dijken , S , Barnaś , J & Stobiecki , T 2017 , ' Influence of intermixing at the Ta/CoFeB interface on spin Hall angle in Ta/CoFeB/MgO heterostructures ' Scientific Reports , vol 7 , no. 1 , 968 , pp. 1-11 . DOI: 10.1038/s41598-017-00994-z en
dc.identifier.issn 2045-2322
dc.identifier.other PURE UUID: b08832fc-4e2f-4d10-922a-ee5d23b5116f
dc.identifier.other PURE ITEMURL:
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dc.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}}.{\bf{2}} θ SH N ≈ - 0. 2 in Ta and a strongly temperature-dependent {{\boldsymbol{\theta }}}-{{\boldsymbol{SH}}}^{{\boldsymbol{N}}} θ SH N for the intermixed Ta/CoFeB interface. en
dc.format.extent 1-11
dc.format.mimetype application/pdf
dc.language.iso en en
dc.relation info:eu-repo/grantAgreement/EC/FP7/307502/EU//E-CONTROL
dc.relation.ispartofseries Scientific Reports en
dc.relation.ispartofseries Volume 7, issue 1 en
dc.rights openAccess en
dc.subject.other General en
dc.subject.other 114 Physical sciences en
dc.title Influence of intermixing at the Ta/CoFeB interface on spin Hall angle in Ta/CoFeB/MgO heterostructures en
dc.type A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä fi
dc.description.version Peer reviewed en
dc.contributor.department AGH University of Science and Technology
dc.contributor.department Adam Mickiewicz University in Poznan
dc.contributor.department Singulus Technologies
dc.contributor.department Department of Applied Physics
dc.subject.keyword General
dc.subject.keyword 114 Physical sciences
dc.identifier.urn URN:NBN:fi:aalto-201705315150
dc.identifier.doi 10.1038/s41598-017-00994-z
dc.type.version publishedVersion

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