Spin-triplet supercurrent in Co/Ni multilayer Josephson junctions with perpendicular anisotropy
Spin-triplet supercurrent in Co/Ni multilayer Josephson junctions with perpendicular anisotropy
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DOI：
10.1103/physrevb.86.224506
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发表时间：
2012-12-12
影响因子：
3.7
通讯作者：
Birge, Norman O.
中科院分区：
文献类型：
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作者：
Gingrich, E. C.;Quarterman, P.;Birge, Norman O.
我们测量了 S/F'/F/F'/S 形式的约瑟夫森结中的自旋三重态超电流，其中 S 是超导 Nb，F' 是具有面内磁化的薄 Ni 层，F 是具有面外磁化的 Ni/[Co/Ni](n) 多层。这些结中的超电流随 F 层厚度衰减非常缓慢，并且比不包含两个 F' 层的类似结中的超电流大得多。这两个特征是自旋三重态超流的特征特征，它通过 F 层和 F' 层中磁化强度的正交性而最大化。磁性测量证实了 Co/Ni 多层膜的面外各向异性。这些样品的临界电流在制备状态下进行了优化，这对于未来的应用很有用。 DOI：10.1103/PhysRevB.86.224506
We have measured spin-triplet supercurrent in Josephson junctions of the form S/F'/F/F'/S, where S is superconducting Nb, F' is a thin Ni layer with in-plane magnetization, and F is a Ni/[Co/Ni](n) multilayer with out-of-plane magnetization. The supercurrent in these junctions decays very slowly with F-layer thickness and is much larger than in similar junctions not containing the two F' layers. Those two features are the characteristic signatures of spin-triplet supercurrent, which is maximized by the orthogonality of the magnetizations in the F and F' layers. Magnetic measurements confirm the out-of-plane anisotropy of the Co/Ni multilayers. These samples have their critical current optimized in the as-prepared state, which will be useful for future applications. DOI: 10.1103/PhysRevB.86.224506