Superconducting junctions with a ferromagnet as the weak link, where triplet correlations can transport supercurrents over a substantial distance, have been of long-standing interest. In this work, we study the triplet transport in planar La0.7Sr0.3MnO3 (LSMO) nanowire Josephson junctions with NbTi superconducting contacts. By meticulous ion etching with an artificial Pt hard mask, the NbTi/LSMO bilayer is structured to form an LSMO bridge without damaging its top layer. We observe superconducting (critical) currents of the order of 109 A/m2 in a junction with a length of 1.3 μm, and distinguishing superconducting quantum interference (SQI) patterns when sweeping a magnetic field perpendicular (B⊥) to the plane of the wire or parallel (B∥) to the plane and along the wire. The observed Gaussian-shaped SQI pattern is attributed to the diffusive transport of triplet pairs in the LSMO. Our work demonstrates that combinations of oxide magnets with conventional (s-wave) alloy superconductors can be a promising new route to realizing superconducting spintronics.

中文翻译：

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具有长距离耦合的平面半金属铁磁约瑟夫森结的制造

以铁磁体作为薄弱环节的超导结，其中三重态相关性可以将超电流传输很长的距离，长期以来一直引起人们的兴趣。在这项工作中，我们研究了具有 NbTi 超导接触的平面 La0.7Sr0.3MnO3 (LSMO) 纳米线约瑟夫森结中的三重态输运。通过使用人造 Pt 硬掩模进行细致的离子蚀刻，NbTi/LSMO 双层被构造成形成 LSMO 桥，而不会损坏其顶层。我们在长度为 1.3 μm 的结中观察到 109 A/m2 量级的超导（临界）电流，并在扫描垂直于导线平面 (B⊥) 的磁场时区分超导量子干涉 (SQI) 图案或平行于平面 (B∥) 并沿导线。观察到的高斯形 SQI 模式归因于 LSMO 中三重态对的扩散传输。我们的工作表明，氧化物磁体与传统（横波）合金超导体的组合可能是实现超导自旋电子学的一条有前途的新途径。