Tailoring superconducting states in superconductor-ferromagnet hybrids

• 發表在: New Journal of Physics
• Main Authors: A Stellhorn, A Sarkar, E Kentzinger, J Barthel, A Di Bernardo, S Nandi, P Zakalek, J Schubert, T Brückel
• 格式: Article
• 語言: 英语
• 出版: IOP Publishing 2020-01-01
• 主題: superconductor–ferromagnet heterostructures; domain-superconductivity; spin-triplet Cooper pairs; proximity effect
• 在線閱讀: https://doi.org/10.1088/1367-2630/abaa02
• ISSN: 1367-2630

We present results of a comprehensive investigation of two phenomena arising in superconductor(S)/ferromagnet(F) heterostructures of Nb on FePd with a lateral magnetic domain pattern: domain-superconductivity and spin-triplet Cooper pair generation. Resistivity measurements in a magnetic field applied out-of-plane to a Nb/FePd (S/F) sample with high magnetocrystalline anisotropy give evidence of stray field generated domain-wall- and reverse-domain-superconductivity. A corresponding bilayer comprising low magnetocrystalline anisotropy exhibits spin-triplet Cooper pair generation and a notable high variation of the S critical temperature due to spin-triplet generation (Δ T _c ) of 100 mK in an in-plane applied field. Using reference samples we can clearly distinguish stray field from proximity effects. The relevance of the characteristic S and F length scales related to the observed proximity effects is discussed.