期刊
PHYSICAL REVIEW B
卷 79, 期 5, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.79.054405
关键词
exchange interactions (electron); spin valves
We study how a bias voltage changes magnetic exchange interactions. We derive a general expression for magnetic exchange interactions for systems coupled to reservoirs under a bias potential and apply it to spin valves. We find that for metallic systems, the interlayer exchange coupling shows a weak oscillatory dependence on the bias potential. For tunneling systems, we find a quadratic dependence on the bias potential and derive an approximate expression for this bias dependence for a toy model. We give general conditions for when the interlayer exchange coupling is a quadratic function of bias potential.
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