This title appears in the Scientific Report :
2020
Please use the identifier:
http://hdl.handle.net/2128/26571 in citations.
Please use the identifier: http://dx.doi.org/10.1103/PhysRevLett.125.177201 in citations.
Harnessing Orbital-to-Spin Conversion of Interfacial Orbital Currents for Efficient Spin-Orbit Torques
Harnessing Orbital-to-Spin Conversion of Interfacial Orbital Currents for Efficient Spin-Orbit Torques
Current-induced spin-orbit torques (SOTs) allow for the efficient electrical manipulation of magnetism in spintronic devices. Engineering the SOT efficiency is a key goal that is pursued by maximizing the active interfacial spin accumulation or modulating the nonequilibrium spin density that builds...
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Personal Name(s): | Ding, Shilei |
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Ross, Andrew / Go, Dongwook / Baldrati, Lorenzo / Ren, Zengyao / Freimuth, Frank / Becker, Sven / Kammerbauer, Fabian / Yang, Jinbo / Jakob, Gerhard / Mokrousov, Yuriy / Kläui, Mathias (Corresponding author) | |
Contributing Institute: |
Quanten-Theorie der Materialien; IAS-1 JARA - HPC; JARA-HPC JARA-FIT; JARA-FIT Quanten-Theorie der Materialien; PGI-1 |
Published in: | Physical review letters, 125 (2020) 17, S. 177201 |
Imprint: |
College Park, Md.
APS
2020
|
DOI: |
10.1103/PhysRevLett.125.177201 |
Document Type: |
Journal Article |
Research Program: |
Controlling Spin-Based Phenomena |
Link: |
OpenAccess |
Publikationsportal JuSER |
Please use the identifier: http://dx.doi.org/10.1103/PhysRevLett.125.177201 in citations.
Current-induced spin-orbit torques (SOTs) allow for the efficient electrical manipulation of magnetism in spintronic devices. Engineering the SOT efficiency is a key goal that is pursued by maximizing the active interfacial spin accumulation or modulating the nonequilibrium spin density that builds up through the spin Hall and inverse spin galvanic effects. Regardless of the origin, the fundamental requirement for the generation of the current-induced torques is a net spin accumulation. We report on the large enhancement of the SOT efficiency in thulium iron garnet (TmIG)/Pt by capping with a CuOx layer. Considering the weak spin-orbit coupling (SOC) of CuOx, these surprising findings likely result from an orbital current generated at the interface between CuOx and Pt, which is injected into the Pt layer and converted into a spin current by strong SOC. The converted spin current decays across the Pt layer and exerts a “nonlocal” torque on TmIG. This additional torque leads to a maximum colossal enhancement of the SOT efficiency of a factor 16 for 1.5 nm of Pt at room temperature, thus opening a path to increase torques while at the same time offering insights into the underlying physics of orbital transport, which has so far been elusive. |