Low spin-current generation efficiency has impeded further progress in practical spin devices, especially in the form of wireless excitation. To tackle this problem, a unique Plasmonic Diabolo Cavity (PDC) is proposed to enhance the spin pumping (SP) signal. The SP microwave photovoltage is enhanced ∼22-fold by PDC at ferromagnetic resonance (FMR). This improvement owes to the localization of the microwave magnetic field, which drives the spin precession process to more effectively generate photovoltage at the FMR condition. The in-plane anisotropy of spin pumping is found to be suppressed by PDC. Our work suggests that metamaterial resonant structures exhibit rich interactions with spin dynamics and could potentially be applied in future high-frequency spintronics.

中文翻译：

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等离子空竹腔增强自旋泵浦

低自旋电流产生效率阻碍了实际自旋装置的进一步发展，特别是在无线激发的形式中。为了解决这个问题，提出了一种独特的等离子空竹腔（PDC）来增强自旋泵浦（SP）信号。在铁磁共振 (FMR) 中，PDC 将 SP 微波光电压增强了约 22 倍。这种改进归功于微波磁场的定位，它驱动自旋进动过程在 FMR 条件下更有效地产生光电压。发现自旋泵浦的面内各向异性被 PDC 抑制。我们的工作表明，超材料共振结构表现出与自旋动力学的丰富相互作用，并有可能应用于未来的高频自旋电子学。