The spread of Cooper pairs in a ferromagnet in proximity coupled superconductor-ferromagnet structures is shown to cause a strong inverse electromagnetic phenomenon, namely, the long-range transfer of the magnetic field from the ferromagnet to the superconductor. Contrary to the previously investigated inverse proximity effect resulting from the spin polarization of a superconducting surface layer, the characteristic length of the above inverse electrodynamic effect is of the order of the London penetration depth, which usually is much larger than the superconducting coherence length. The corresponding spontaneous currents appear even in the absence of the stray field of the ferromagnet and are generated by the vector-potential of magnetization near the S/F interface, and they should be taken into account in the design of nanoscale S/F devices. Similarly to the well-known Aharonov-Bohm effect, the discussed phenomenon can be viewed as a manifestation of the role of vector potential in quantum physics.

中文翻译：

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平面超导体-铁磁体结构中的电磁邻近效应

库珀对在接近耦合的超导体-铁磁体结构中的铁磁体中的扩散被证明会引起强烈的逆电磁现象，即磁场从铁磁体到超导体的长距离转移。与先前研究的由超导表面层的自旋极化引起的逆邻近效应相反，上述逆电动效应的特征长度是伦敦穿透深度的数量级，通常远大于超导相干长度。即使在没有铁磁体杂散场的情况下也会出现相应的自发电流，并且是由 S/F 界面附近的磁化矢量电位产生的，在纳米级 S/F 器件的设计中应该考虑到它们。