Anwar M S, Kunieda M, Ishiguro R, Lee S R, Sow C, Robinson J W A, Yonezawa S, Noh T W, Maeno Y
Department of Materials Science and Metallurgy, University of Cambridge, Cambridge, UK.
Department of Physics, Kyoto University, Kyoto, 606-8502, Japan.
Sci Rep. 2019 Nov 1;9(1):15827. doi: 10.1038/s41598-019-52003-0.
Spin-polarized supercurrents can be generated with magnetic inhomogeneity at a ferromagnet/spin-singlet-superconductor interface. In such systems, complex magnetic inhomogeneity makes it difficult to functionalise the spin-polarized supercurrents. However, spin-polarized supercurrents in ferromagnet/spin-triplet-superconductor junctions can be controlled by the angle between magnetization and spin of Copper pairs (d-vector), that can effectively be utilized in developing of a field of research known as superconducting spintronics. Recently, we found induction of spin-triplet correlation into a ferromagnet SrRuO epitaxially deposited on a spin-triplet superconductor SrRuO, without any electronic spin-flip scattering. Here, we present systematic magnetic field dependence of the proximity effect in Au/SrRuO/SrRuO junctions. It is found that induced triplet correlations exhibit strongly anisotropic field response. Such behaviour is attributed to the rotation of the d-vector of SrRuO. This anisotropic behaviour is in contrast with the vortex dynamic. Our results will stimulate study of interaction between ferromagnetism and unconventional superconductivity.
在铁磁体/自旋单重态超导体界面处，利用磁不均匀性可产生自旋极化超电流。在这类系统中，复杂的磁不均匀性使得自旋极化超电流难以实现功能化。然而，铁磁体/自旋三重态超导体结中的自旋极化超电流可由磁化强度与库珀对自旋（d矢量）之间的夹角控制，这可有效地用于发展一个名为超导自旋电子学的研究领域。最近，我们发现，在没有任何电子自旋翻转散射的情况下，自旋三重态关联被诱导到外延沉积在自旋三重态超导体SrRuO上的铁磁体SrRuO中。在此，我们展示了Au/SrRuO/SrRuO结中近邻效应的系统磁场依赖性。结果发现，诱导的三重态关联表现出强烈的各向异性场响应。这种行为归因于SrRuO的d矢量的旋转。这种各向异性行为与涡旋动力学形成对比。我们的结果将激发对铁磁性与非常规超导性之间相互作用的研究。
