Magnetic proximity effect in multiband superconductor/ferromagnetic metal (S/F) structures was studied. Analytical solutions of the Usadel equations obtained for a number of limiting cases are applied in the case when the transport properties of both metals correspond to the diffusion type of conductivity. The induced (proximity) magnetic characteristics are shown to reflect the multiband structure of the superconductor and significantly depend on the state of the S/F boundary for each of the S layer bands and the magnitude of the exchange interaction in the F layer. The main manifestations of induced magnetism for each S layer band near the S/F interface are considered: additional suppression of the superconducting order parameter by the exchange field, spin splitting of quasiparticle states, formation of local states inside the energy gap, and induced equilibrium magnetization of unpaired electrons in the S layer.

中文翻译：

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多频带超导体/铁磁金属结构中的磁邻近效应

研究了多频带超导体/铁磁金属 (S/F) 结构中的磁邻近效应。Usadel 方程的解析解适用于多种极限情况，适用于两种金属的传输特性对应于扩散类型的电导率的情况。所显示的感应（邻近）磁特性反映了超导体的多带结构，并且在很大程度上取决于每个 S 层带的 S/F 边界状态和 F 层中交换相互作用的大小。考虑了 S/F 界面附近每个 S 层带的感应磁性的主要表现：交换场对超导有序参数的额外抑制，准粒子态的自旋分裂，能隙内局部态的形成，