Enhanced Spin-Orbit Torque via Modulation of Spin Current Absorption
Type
ArticleAuthors
Qiu, XuepengLegrand, William
He, Pan
Wu, Yang
Yu, Jiawei
Ramaswamy, Rajagopalan
Manchon, Aurelien

Yang, Hyunsoo
KAUST Department
Material Science and Engineering ProgramPhysical Science and Engineering (PSE) Division
Spintronics Theory Group
Date
2016-11-18Permanent link to this record
http://hdl.handle.net/10754/621917
Metadata
Show full item recordAbstract
The magnitude of spin-orbit torque (SOT), exerted to a ferromagnet (FM) from an adjacent heavy metal (HM), strongly depends on the amount of spin current absorbed in the FM. We exploit the large spin absorption at the Ru interface to manipulate the SOTs in HM/FM/Ru multilayers. While the FM thickness is smaller than its spin dephasing length of 1.2 nm, the top Ru layer largely boosts the absorption of spin currents into the FM layer and substantially enhances the strength of SOT acting on the FM. Spin-pumping experiments induced by ferromagnetic resonance support our conclusions that the observed increase in the SOT efficiency can be attributed to an enhancement of the spin-current absorption. A theoretical model that considers both reflected and transmitted mixing conductances at the two interfaces of FM is developed to explain the results.Citation
Qiu X, Legrand W, He P, Wu Y, Yu J, et al. (2016) Enhanced Spin-Orbit Torque via Modulation of Spin Current Absorption. Physical Review Letters 117. Available: http://dx.doi.org/10.1103/PhysRevLett.117.217206.Sponsors
This research is supported by the National Research Foundation (NRF), Prime Minister’s Office, Singapore, under its Competitive Research Programme (CRP Award No. NRFCRP12-2013-01). H. Y. is a member of the Singapore Spintronics Consortium (SG-SPIN). A. M. acknowledges support from King Abdullah University of Science and Technology (KAUST).Publisher
American Physical Society (APS)Journal
Physical Review LettersarXiv
arXiv:1610.06989Additional Links
http://journals.aps.org/prl/abstract/10.1103/PhysRevLett.117.217206ae974a485f413a2113503eed53cd6c53
10.1103/PhysRevLett.117.217206