论文标题
正常金属/超导体结构中的表面结合状态引起的自旋泵的大大增强
Large enhancement of spin pumping due to the surface bound states in normal metal/superconductor structures
论文作者
论文摘要
我们表明，超导相关性可以强烈刺激从铁磁绝缘子到相邻金属自旋水槽的自旋泵送。 负责这种作用的关键物理机制是在铁磁绝缘子/超导体界面上存在准粒子表面状态。当这些状态出现时，我们会考虑最小模型，因为界面正常层中的配对常数被抑制。对于薄的正常层，我们获得了吉尔伯特阻尼系数的强峰值温度依赖性，该系数最近在此类系统中观察到。对于较厚的正常层，吉尔伯特（Gilbert）抑制作用单调增加到比关键的温度小得多。建议的模型通过制造杂交正常金属/超导体自旋水槽来控制自旋泵的温度依赖性的道路。
We show that the spin pumping from ferromagnetic insulator into the adjacent metallic spin sink can be strongly stimulated by the superconducting correlations. The key physical mechanism responsible for this effect is the presence of quasiparticle surface states at the ferromagnetic insulator/superconductor interface. We consider the minimal model when these states appear because of the suppressed pairing constant within the interfacial normal layer. For thin normal layers we obtain a strongly peaked temperature dependence of the Gilbert damping coefficient which has been recently observed in such systems. For thicker normal layers the Gilbert damping monotonically increases down to the temperatures much smaller than the critical one. The suggested model paves the way to controlling the temperature dependence of the spin pumping by fabricating hybrid normal metal/superconductor spin sinks.
