磁性非均匀坡莫合金层引起的Nb基异质结构中的长程邻近效应
Long-range proximity effect in Nb-based heterostructures induced by a magnetically inhomogeneous permalloy layer
摘要：
奇频三重态库珀对被认为是铁磁体中长程超导关联的载流子。这种三重态对是由超导体（S）和铁磁体（F）之间界面处的不均匀磁性产生的。到目前为止，只有在设计用于提供磁不均匀性的复杂层状结构中才报道了可再现的长程效应。在这里，我们表明，自旋三重态对的形成可以在简单的非结构化的Nb/坡莫合金（Py = Ni_（0.8）Fe_（0.2））/Nb三层和Nb/Py双层，但只有当铁磁层的厚度范围在140和250 nm之间。该效应与固有非均匀磁状态的出现有关，该磁状态是Py中众所周知的条纹制度的前体，在我们的样品中，该条纹制度的厚度大于300 nm。
英文摘要：
Odd-frequency triplet Cooper pairs are believed to be the carriers of long-range superconducting correlations in ferromagnets. Such triplet pairs are generated by inhomogeneous magnetism at the interface between a superconductor (S) and a ferromagnet (F). So far, reproducible long-range effects were reported only in complex layered structures designed to provide the magnetic inhomogeneity. Here we show that spin triplet pair formation can be found in simple unstructured Nb/Permalloy (Py = Ni_0.8Fe_0.2)/Nb trilayers and Nb/Py bilayers, but only when the thickness of the ferromagnetic layer ranges between 140 and 250 nm. The effect is related to the emergence of an intrinsically inhomogeneous magnetic state, which is a precursor of the well-known stripe regime in Py that in our samples sets in at thickness larger than 300 nm.
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