Fabrication and characterization of epitaxial films of superconductor NbN and highly spin-polarized heusler alloy Co22Fe0.4Mn0.6Si

Iduru Shigeta, Takahide Kubota, Kazumasa Makise, Shojiro Kimura, Satoshi Awaji, Bunju Shinozaki, Keiichi Koyama, Koki Takanashi, Masahiko Hiroi

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)

Abstract

We report structural, magnetic, and transport properties of epitaxial films of superconductor NbN and highly spin-polarized Heusler alloy Co22Fe0.4Mn0.6Si (CFMS). The saturation magnetization Ms of the film was 870 emu/cm3, which is slightly smaller than values reported earlier. With an increase of CFMS thickness dCFMS, the sheet resistance Rsq decreased and the upper critical field μ0Hc2 (0) decreased monotonically, while the superconducting transition temperature Tc exhibited a minimum around dCFMS = 3 nm. A theoretical analysis of superconducting fluctuations revealed that the high spin polarization of the CFMS layer affected the pair breaking parameter δ, the superconducting coherence length σ (0), and the diffusion coefficient D.

Original languageEnglish
Article number7887659
Pages (from-to)1-5
Number of pages5
JournalIEEE Magnetics Letters
Volume8
DOIs
Publication statusPublished - 2017

Keywords

  • Heusler alloy
  • Superconducting spintronics
  • epitaxial film
  • spin-polarized material
  • super-conductor
  • superconducting fluctuations

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials

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