论文标题
表面等离子体对薄膜系统中自旋电流的影响
Effects of surface plasmons on spin currents in a thin film system
论文作者
论文摘要
我们提出和分析薄金属膜中的表面平板驱动的电子自旋电流。金属中的电子气体遵循表面等离子体（SPS）的横向旋转电场，该电场导致静态磁化梯度。我们在薄膜绝缘剂 - 金属构造器结构中考虑此处的SP，并在存在磁化梯度的情况下求解自旋扩散方程。结果表明，金属界面处的SP会在金属膜中产生自旋电流。对于较薄的膜，SP会强烈杂交，从而增加磁化梯度并增强自旋电流。我们还讨论了自旋电流如何取决于SP波长和金属的自旋扩张长度。旋转电流的极化可以通过调整SPS的波长和/或自旋扩散长度来控制。
We propose and analyze surface-plasmon-driven electron spin currents in a thin metallic film. The electron gas in the metal follows the transversally rotating electric fields of the surface plasmons (SPs), which leads to a static magnetization gradient. We consider herein SPs in a thin-film insulator-metal-insulator structure and solve the spin diffusion equation in the presence of a magnetization gradient. The results reveal that the SPs at the metal interfaces generate spin currents in the metallic film. For thinner film, the SPs become strongly hybridized, which increases the magnetization gradient and enhances the spin current. We also discuss how the spin current depends on SP wavelength and the spin-diffusion length of the metal. The polarization of the spin current can be controlled by tuning the wavelength of the SPs and/or the spin diffusion length.
