Direct penetration of spin-triplet superconductivity into a ferromagnet in Au/SrRuO3/Sr2RuO4 junctions

M. S. Anwar (), S. R. Lee, R. Ishiguro, Y. Sugimoto, Y. Tano, S. J. Kang, Y. J. Shin, S. Yonezawa, D. Manske, H. Takayanagi, T. W. Noh and Y. Maeno
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M. S. Anwar: Graduate School of Science, Kyoto University
S. R. Lee: Center for Correlated Electron Systems, Institute for Basic Science (IBS)
R. Ishiguro: Tokyo University of Science
Y. Sugimoto: Graduate School of Science, Kyoto University
Y. Tano: Tokyo University of Science
S. J. Kang: Center for Correlated Electron Systems, Institute for Basic Science (IBS)
Y. J. Shin: Center for Correlated Electron Systems, Institute for Basic Science (IBS)
S. Yonezawa: Graduate School of Science, Kyoto University
D. Manske: Max-Planck-Institut fur Festkorperforschung
H. Takayanagi: Tokyo University of Science
T. W. Noh: Center for Correlated Electron Systems, Institute for Basic Science (IBS)
Y. Maeno: Graduate School of Science, Kyoto University

Nature Communications, 2016, vol. 7, issue 1, 1-7

Abstract: Abstract Efforts have been ongoing to establish superconducting spintronics utilizing ferromagnet/superconductor heterostructures. Previously reported devices are based on spin-singlet superconductors (SSCs), where the spin degree of freedom is lost. Spin-polarized supercurrent induction in ferromagnetic metals (FMs) is achieved even with SSCs, but only with the aid of interfacial complex magnetic structures, which severely affect information imprinted to the electron spin. Use of spin-triplet superconductors (TSCs) with spin-polarizable Cooper pairs potentially overcomes this difficulty and further leads to novel functionalities. Here, we report spin-triplet superconductivity induction into a FM SrRuO3 from a leading TSC candidate Sr2RuO4, by fabricating microscopic devices using an epitaxial SrRuO3/Sr2RuO4 hybrid. The differential conductance, exhibiting Andreev-reflection features with multiple energy scales up to around half tesla, indicates the penetration of superconductivity over a considerable distance of 15 nm across the SrRuO3 layer without help of interfacial complex magnetism. This demonstrates potential utility of FM/TSC devices for superspintronics.

Date: 2016
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DOI: 10.1038/ncomms13220

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