Electrically controlled spin-switch and evolution of Hanle spin precession in graphene
Journal article, 2019
Next generation of spintronic devices aims to utilize the spin-polarized current injection and transport to control the magnetization dynamics in the spin logic and memory technology. However, the detailed evolution process of the frequently observed bias current-induced sign change phenomenon of the spin polarization has not been examined in details and the underlying microscopic mechanism is not well understood. Here, we report the observation of a systematic evolution of the sign change process of Hanle spin precession signal in the graphene nonlocal spintronic devices at room temperature. By tuning the interface tunnel resistances of the ferromagnetic contacts to graphene, different transformation processes of Hanle spin precession signal are probed in a controlled manner by tuning the injection bias current/voltage. Detailed analysis and first-principles calculations indicate a possible magnetic proximity and the energy dependent electronic structure of the ferromagnet-graphene interface can be responsible for the sign change process of the spin signal and open a new perspective to realize a spin-switch at very low bias-current or voltage.
magnetic proximity effect
spintronics
graphene
Hanle spin precession
spin injection
Author
Bing Zhao
University of Science and Technology Beijing
Chalmers, Microtechnology and Nanoscience (MC2), Quantum Device Physics
Dmitrii Khokhriakov
Chalmers, Microtechnology and Nanoscience (MC2), Quantum Device Physics
Bogdan Karpiak
Chalmers, Microtechnology and Nanoscience (MC2), Quantum Device Physics
Anamul Md Hoque
Chalmers, Microtechnology and Nanoscience (MC2), Quantum Device Physics
Lei Xu
National University of Singapore (NUS)
Lei Shen
National University of Singapore (NUS)
Yuan Ping Peng
National University of Singapore (NUS)
Xiaoguang Xu
University of Science and Technology Beijing
Yong Jiang
University of Science and Technology Beijing
Saroj Prasad Dash
Graphene Centre at Chalmers
Chalmers, Microtechnology and Nanoscience (MC2), Quantum Device Physics
2D Materials
2053-1583 (eISSN)
Vol. 6 3 035042Subject Categories
Other Physics Topics
Other Electrical Engineering, Electronic Engineering, Information Engineering
Condensed Matter Physics
DOI
10.1088/2053-1583/ab1d83