This title appears in the Scientific Report :
2020
Please use the identifier:
http://hdl.handle.net/2128/26572 in citations.
Please use the identifier: http://dx.doi.org/10.1103/PhysRevResearch.2.013177 in citations.
Orbital torque: Torque generation by orbital current injection
Orbital torque: Torque generation by orbital current injection
We propose a mechanism of torque generation by injection of an orbital current, which we call orbital torque. In a magnetic bilayer consisting of a nonmagnet (NM) and a ferromagnet (FM), we consider a situation where the spin-orbit coupling (SOC) is present only in the FM. Although the SOC is absent...
Saved in:
Personal Name(s): | Go, Dongwook |
---|---|
Lee, Hyun-Woo (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 research, 2 (2020) 1, S. 013177 |
Imprint: |
College Park, MD
APS
2020
|
DOI: |
10.1103/PhysRevResearch.2.013177 |
Document Type: |
Journal Article |
Research Program: |
Controlling Spin-Based Phenomena |
Link: |
OpenAccess |
Publikationsportal JuSER |
Please use the identifier: http://dx.doi.org/10.1103/PhysRevResearch.2.013177 in citations.
We propose a mechanism of torque generation by injection of an orbital current, which we call orbital torque. In a magnetic bilayer consisting of a nonmagnet (NM) and a ferromagnet (FM), we consider a situation where the spin-orbit coupling (SOC) is present only in the FM. Although the SOC is absent in the NM, the orbital Hall effect can arise in the NM. When the resulting orbital Hall current is injected to the FM, the SOC of the FM converts the orbital angular momentum into spin, which exerts torque to the magnetization of the FM. Remarkably, even for small SOC strength comparable to that of 3d FMs, the orbital torque can be comparable to the spin torque induced by the spin Hall effect of the NM with strong SOC. This provides a way to experimentally probe the OHE and opens a venue to achieving spin-torque devices based on light elements that exhibit gigantic orbital response. Experimental implications are discussed. |