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

doi:10.1109/LMAG.2017.2687878

Fabrication and characterization of epitaxial films of superconductor NbN and highly spin-polarized heusler alloy Co₂2Fe_0.4Mn_0.6Si

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

Research output: Contribution to journal › Article › peer-review

5 Citations (Scopus)

Abstract

We report structural, magnetic, and transport properties of epitaxial films of superconductor NbN and highly spin-polarized Heusler alloy Co₂2Fe_0.4Mn_0.6Si (CFMS). The saturation magnetization M_s of the film was 870 emu/cm3, which is slightly smaller than values reported earlier. With an increase of CFMS thickness d_CFMS, the sheet resistance R_sq decreased and the upper critical field μ0H_c2 (0) decreased monotonically, while the superconducting transition temperature T_c exhibited a minimum around d_CFMS = 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 language	English
Article number	7887659
Pages (from-to)	1-5
Number of pages	5
Journal	IEEE Magnetics Letters
Volume	8
DOIs	https://doi.org/10.1109/LMAG.2017.2687878
Publication status	Published - 2017

Keywords

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

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials

Access to Document

10.1109/LMAG.2017.2687878

Cite this

@article{1b66ffca5b1c4768b0f8b68adef99fe6,

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

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.",

keywords = "Heusler alloy, Superconducting spintronics, epitaxial film, spin-polarized material, super-conductor, superconducting fluctuations",

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

note = "Publisher Copyright: {\textcopyright} 2010-2012 IEEE.",

year = "2017",

doi = "10.1109/LMAG.2017.2687878",

language = "English",

volume = "8",

pages = "1--5",

journal = "IEEE Magnetics Letters",

issn = "1949-307X",

publisher = "Institute of Electrical and Electronics Engineers Inc.",

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T1 - Fabrication and characterization of epitaxial films of superconductor NbN and highly spin-polarized heusler alloy Co22Fe0.4Mn0.6Si

AU - Shigeta, Iduru

AU - Kubota, Takahide

AU - Makise, Kazumasa

AU - Kimura, Shojiro

AU - Awaji, Satoshi

AU - Shinozaki, Bunju

AU - Koyama, Keiichi

AU - Takanashi, Koki

AU - Hiroi, Masahiko

PY - 2017

Y1 - 2017

N2 - 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.

AB - 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.

KW - Heusler alloy

KW - Superconducting spintronics

KW - epitaxial film

KW - spin-polarized material

KW - super-conductor

KW - superconducting fluctuations

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