Investigation of the quaternary Fe2 - XCoxMnSi (0 ≤ x ≤ 0.6) alloys by structural, magnetic, resistivity and spin polarization measurements

Lakhan Bainsla, M. Manivel Raja, A. K. Nigam, B. S.D.Ch S. Varaprasad, Y. K. Takahashi, K. G. Suresh, K. Hono

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17 Citations (Scopus)

Abstract

A detailed study of the Fe2 - xCoxMnSi (0 ≤ x ≤ 0.6) alloys has been carried out by investigating the samples by x-ray diffraction, Mössbauer spectroscopy, magnetization, transport and current spin polarization measurements. A perfectly ordered L21 phase is found to exist for x = 0.4. Competing magnetic interactions between ferromagnetic and antiferromagnetic (AFM) phases are seen in the alloys with x < 0.2, whereas the AFM phase is completely absent for x ≥ 0.2 as revealed by the magnetization and resistivity data. The Curie temperature and saturation magnetization values increase with increase in the Co concentration. Anomalous, non metallic-like behaviour is observed for x = 0.4. Current spin polarization values of 0.61 ± 0.01 and 0.66 ± 0.01 were deduced for x = 0.2 and x = 0.4 respectively, using the point contact Andreev reflection spectroscopy . Considering the high spin polarization and Curie temperature, materials with x ≥ 0.2 appear to be very promising for spintronic devices.

Original languageEnglish
Article number125002
JournalJournal of Physics D: Applied Physics
Volume48
Issue number12
DOIs
Publication statusPublished - 2015 Apr 1
Externally publishedYes

Keywords

  • Andreev reflection spectroscopy
  • Heusler alloys
  • magnetoresistance
  • spin polarization

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Acoustics and Ultrasonics
  • Surfaces, Coatings and Films

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