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Enhanced spin-orbit torques in Pt/Co/Ta heterostructures

Author(s)
Woo, Seonghoon; Tan, Aik Jun; Mann, Maxwell S.; Caretta, Lucas Marcelo; Beach, Geoffrey Stephen
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Abstract
Spin-orbit torques (SOTs) are studied in perpendicularly magnetized ultrathin Co films sandwiched between two heavy metals, Pt and Ta. A significant enhancement of the Slonczewski-like torque is achieved by placing dissimilar metals with opposite spin Hall angles on opposite sides of the ferromagnet. SOTs were characterized through harmonic measurements and the contribution by the Ta overlayer was isolated by systematically varying its thickness. An effective spin Hall angle of up to 34% is observed, along with a sizable field-like torque that increases with increasing Ta layer thickness. Current-induced switching measurements reveal a corresponding increase in switching efficiency, suggesting that by engineering both interfaces in trilayer structures, the SOTs can be significantly improved.
Date issued
2014-11
URI
http://hdl.handle.net/1721.1/101763
Department
Massachusetts Institute of Technology. Department of Materials Science and Engineering
Journal
Applied Physics Letters
Publisher
American Institute of Physics (AIP)
Citation
Woo, Seonghoon, Maxwell Mann, Aik Jun Tan, Lucas Caretta, and Geoffrey S. D. Beach. “Enhanced Spin-Orbit Torques in Pt/Co/Ta Heterostructures.” Applied Physics Letters 105, no. 21 (November 24, 2014): 212404. © 2014 AIP Publishing LLC
Version: Final published version
ISSN
0003-6951
1077-3118

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