超导性对脏SF结中非均匀磁化的影响
Effect of superconductivity on non-uniform magnetization in dirty SF junctions
AI总结：
研究超导性对脏SF结中非均匀磁化的影响，通过近邻效应和磁刚性竞争，揭示共振点处均匀磁态的不稳定性及强非均匀磁态的特性。
摘要：
我们研究了 bulk 超导体与其表面薄 disorder 顺磁层之间的隧道结中的近邻效应。从超导体穿透到顺磁体的库珀对倾向于破坏其均匀磁序。这种效应与顺磁体固有磁刚性之间的竞争导致了均匀磁态与非均匀磁态之间的二级相变。利用 quasiclassical Usadel 方程，我们推导了该相变的 Landau 功能，并构建了该效应的完整相图。我们识别出一个特殊的
英文摘要：
We study proximity effect in a tunnel junction between a bulk superconductor and a thin disordered ferromagnetic layer on its surface. Cooper pairs penetrating from the superconductor into the ferromagnet tend to destabilize its uniform magnetic order. The competition of this effect and the intrinsic magnetic stiffness of the ferromagnet leads to a second order phase transition between uniform and non-uniform magnetic states. Using the quasiclassical Usadel equation, we derive the Landau functional for this transition and construct the complete phase diagram of the effect. We identify a special point of "resonance" at which the characteristic energy scale of the proximity effect equals the exchange field of the ferromagnet. At this point, the uniform magnetic state is unstable even in the limit of large stiffness. We further explore the parameter regime far beyond the transition and determine the properties of the resulting strongly non-uniform magnetic state.
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