Influence of the magnetic proximity effect on spin-orbit torque efficiencies in ferromagnet/platinum bilayers

T. A. Peterson, A. P. McFadden, C. J. Palmstrøm, P. A. Crowell

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Abstract

Current-induced spin-orbit torques in Co2FeAl/Pt ultrathin bilayers are studied using a magnetoresistive harmonic response technique, which distinguishes the dampinglike and fieldlike contributions. The presence of a temperature-dependent magnetic proximity effect is observed through the anomalous Hall and anisotropic magnetoresistances, which are enhanced at low temperatures for thin platinum thicknesses. The fieldlike torque efficiency decreases steadily as the temperature is lowered for all Pt thicknesses studied, which we propose is related to the influence of the magnetic proximity effect on the fieldlike torque mechanism.

Original languageEnglish (US)
Article number020403
JournalPhysical Review B
Volume97
Issue number2
DOIs
StatePublished - Jan 10 2018

Bibliographical note

Funding Information:
This work was supported by C-SPIN, one of the six centers of STARnet, a SRC Program sponsored by MARCO and DARPA, the NSF through DMR-1708287, and the NSF NNCI Program.

Funding Information:
We thank C. Liu for helpful discussions. This work was supported by C-SPIN, one of the six centers of STARnet, a SRC Program sponsored by MARCO and DARPA, the NSF through DMR-1708287, and the NSF NNCI Program.

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