Determination of spin torque efficiencies in heterostructures with perpendicular magnetic anisotropy
Name
PhysRevB.93.144409.pdf
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2.95 MB
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Author(s)
Pai, Chi-Feng
Tan, Aik Jun
Mann, Maxwell S.
Beach, Geoffrey Stephen
Date Issued
April 2016
Journal
Physical Review B
Publisher
American Physical Society
Citation
Pai, Chi-Feng, Maxwell Mann, Aik Jun Tan, and Geoffrey S. D. Beach. “Determination of Spin Torque Efficiencies in Heterostructures with Perpendicular Magnetic Anisotropy.” Physical Review B 93, no. 14 (April 8, 2016). © 2016 American Physical Society
Version
Final published version
Abstract
We report that by measuring a current-induced hysteresis loop shift versus in-plane bias magnetic field, the spin-Hall effect (SHE) contribution of the current-induced effective field per current density χ[subscript SHE] can be estimated for Pt- and Ta-based magnetic heterostructures with perpendicular magnetic anisotropy. We apply this technique to a Pt-based sample with its ferromagnetic (FM) layer being wedged deposited and discover an extra effective field contribution χ[subscript Wedged] due to the asymmetric nature of the deposited FM layer. We confirm the correlation between χ[subscript Wedged] and the asymmetric depinning process in FM layer during magnetization switching by magneto-optical Kerr microscopy. These results indicate the possibility of engineering deterministic spin-orbit torque switching by controlling the symmetry of domain expansion through the materials growth process.
MIT Department
Massachusetts Institute of Technology. Department of Materials Science and Engineering
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DOI of Published Version
https://doi.org/10.1103/PhysRevB.93.144409
