Magnetic and structural properties of rapidly quenched tetragonal Mn 3-xGa nanostructures

Y. Huh, P. Kharel, V. R. Shah, E. Krage, R. Skomski, J. E. Shield, D. J. Sellmyer

Research output: Contribution to journalArticle

31 Scopus citations

Abstract

Nanostructured Mn3-x Ga ribbons with x = 0, 0.4, 0.9 and 1.1 were prepared using arc-melting, melt-spinning and annealing. As-spun samples crystallized into hexagonal D019 and cubic L21 Heusler crystal structures based on the concentration of Mn in Mn3-x Ga. Upon vacuum-annealing the samples at 450 °C for about 50 hours, both the hexagonal and cubic structures transformed into a tetragonal D022 structure. High-temperature x-ray diffraction and high-temperature magnetometry showed that the samples with low Mn content (Mn1.9 Ga and Mn 2.1 Ga) retain their tetragonal structure up to 850 K but the samples with high Mn concentrations (Mn2.6 Ga and Mn3.0 Ga) undergo a structural phase transition from tetragonal to hexagonal phases around 800 K. The magnetic properties of Mn3-x Ga ribbons were very sensitive to Mn concentration, where the magnetization and anisotropy energy increased and the coercivity decreased as x increased from 0 to 1.1. Although the Curie temperatures of Mn2.6 Ga and Mn3.0 Ga samples could not be determined because of the structural phase transition, the Curie temperature decreased with increasing x in Mn3-xGa. The maximum magnetization of 57 emu/g (300 emu/cm3) and the coercivity of 6.5 kOe were measured in the Mn1.9 Ga and Mn3.0 Ga ribbons, respectively.

Original languageEnglish (US)
Article number6558957
Pages (from-to)3277-3280
Number of pages4
JournalIEEE Transactions on Magnetics
Volume49
Issue number7
DOIs
StatePublished - Aug 2 2013

Keywords

  • Magnetic anisotropy
  • melt-spun ribbons
  • permanent magnet
  • spintronic device

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Electrical and Electronic Engineering

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