带陷阱的自旋输运：Hanle曲线的急剧变窄
Spin transport with traps: dramatic narrowing of the Hanle curve
摘要：
我们从理论上研究了器件中的自旋输运，在该器件中，有源层是一个有机薄膜，具有许多深的间隙能级作为陷阱。在磁化注入器和探测器之间扩散的载流子在陷阱上花费相当大的一部分时间。这种新的传输特性并不影响巨磁电阻效应，因为巨磁电阻效应只对注入器和探测器的相互磁化方向敏感。相反，陷阱的存在强烈影响自旋输运对垂直于电极磁化方向的外部磁场的灵敏度（Hanle效应）。也就是说，汉勒曲线急剧变窄。这种变窄的起源是自旋进动发生在电极之间的载流子运动的整个时间期间，而自旋弛豫仅发生在随后的陷阱之间的扩散运动期间。如果汉勒曲线的宽度小于测量分辨率，则无法观察到汉勒峰。
英文摘要：
We study theoretically the spin transport in a device in which the active layer is an organic film with numerous deep in-gap levels serving as traps. A carrier, diffusing between magnetized injector and detector, spends a considerable portion of time on the traps. This new feature of transport does not affect the giant magnetoresistance, which is sensitive only to the mutual orientation of magnetizations of the injector and detector. By contrast, the presence of traps strongly affects the sensitivity of the spin transport to external magnetic field perpendicular to the magnetizations of the electrodes (the Hanle effect). Namely, the Hanle curve narrows dramatically. The origin of such a narrowing is that the spin precession takes place during the entire time of the carrier motion between the electrodes, while the spin relaxation takes place only during diffusive motion between the subsequent traps. If the resulting width of the Hanle curve is smaller than the measurement resolution, observation of the Hanle peak becomes impossible.
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