Improvement of Spin Transfer Torque in Asymmetric Graphene Devices

A graphene lateral spin valve structure with asymmetric contacts is presented for the first time, with enhancement of spin angular momentum absorption in its receiving magnet. The asymmetric device with tunneling barrier only at the injector magnet shows a comparable spin valve signal but lower elec...

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Published inACS nano Vol. 8; no. 4; pp. 3807 - 3812
Main Authors Lin, Chia-Ching, Gao, Yunfei, Penumatcha, Ashish Verma, Diep, Vinh Quang, Appenzeller, Joerg, Chen, Zhihong
Format Journal Article
LanguageEnglish
Published United States American Chemical Society 22.04.2014
Subjects
Asymmetry
Barriers
Current density
Devices
Graphene
Spin valves
Torque
Tunneling
tunneling barrier
all-spin logic
asymmetric contact
nonlocal spin valve
spin transfer torque
graphene
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Summary:A graphene lateral spin valve structure with asymmetric contacts is presented for the first time, with enhancement of spin angular momentum absorption in its receiving magnet. The asymmetric device with tunneling barrier only at the injector magnet shows a comparable spin valve signal but lower electrical noises compared to the device with two tunneling barriers. We also report experimental measurements of spin transfer torque. Assisted by an external magnetic field of 2.5 mT, spin diffusion current-induced magnetization reversal occurs at a nonlocal charge current density of 33 mA/μm2, smaller than that needed in devices with two tunneling barriers.
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ISSN:1936-0851
1936-086X
DOI:10.1021/nn500533b