Observation of spin dependent electrochemical potentials at room temperature in a quantum well structure

Title
Observation of spin dependent electrochemical potentials at room temperature in a quantum well structure
Authors
장준연구현철김형준박윤호
Keywords
Potentiometric measurement; electrochemical potential; Rashba effect; spin torque
Issue Date
2017-11
Publisher
Current applied physics
Citation
VOL 17, NO 11-1458
Abstract
Spin transport with a strong Rashba spin splitting is observed in a semiconductor channel. Using the current injection into the side of the quantum well, the potentiometric signal and the spin-torque-induced magnetization change are simultaneously detected. In this geometry, the spin current is directly injected from the ferromagnetic electrode into the quantum well channel and the electrochemical potential is monitored by the detection ferromagnet. For the side injection instead of vertical injection, the milling of the top cladding layer is not necessary, so the efficient spin transport and the undamaged Rashba spin splitting can be realized. The ferromagnetic detector senses the Rashba-effect-induced electrochemical potential shift brought by the charge current and this potentiometric signal is also modified by the magnetization rotation induced by the spin current. The large potential changes of 1.03 Ω and 0.96 Ω are observed at 1.8 K and 300 K, respectively.
URI
http://pubs.kist.re.kr/handle/201004/66573
ISSN
1567-1739
Appears in Collections:
KIST Publication > Article
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