Microstructure and magnetic properties of Co-doped rapidly solidified Ni 50 Mn 25−x Co x Ga 25 Heusler alloys

K. Meghana, D. K. Satapathy, I. A. Al-Omari, T. Adhikary, S. Aich*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

Cobalt-doped melt-spun ribbons of Ni 50 Mn 25−x Co x Ga 25 were prepared to study the influence of cobalt on the magnetic properties of the NiMnGa based Heusler alloy. Bulk specimens were also prepared for a comparative study. The bulk specimens and the melt spun ribbons were annealed at 900 °C for 5 h followed by quenching. Microstructural studies revealed an extensively twinned structure which is beneficial for magnetic field induced strain. The magnetization measurements showed a reduction in the moment with an increase in the cobalt content from 78.4 emu/g to 52.7 emu/g for Co (x = 6) and Co (x = 10), respectively. A reduction was also observed in the T C when cobalt content was increased from Co (x = 6) (T C = 386 K) to Co (x = 10) (T C = 263 K).

Original languageEnglish
Pages (from-to)162-165
Number of pages4
JournalMaterials Letters
Volume245
DOIs
Publication statusPublished - Jun 15 2019
Externally publishedYes

Keywords

  • Compound twins
  • Curie transition
  • Heusler alloy
  • Magnetic materials
  • Secondary twinning
  • Shape memory materials

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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