Atomic ordering and magnetic properties in Ni2Mn(GaxAl1-x) Heusler alloys

H. Ishikawa, R. Y. Umetsu, K. Kobayashi, A. Fujita, R. Kainuma, K. Ishida

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50 Citations (Scopus)

Abstract

The phase stability and magnetic properties of Ni2Mn(GaxAl1-x) alloys were studied by differential scanning calorimetric and magnetometric measurements, and X-ray diffraction and transmission electronic microscopic observations. The order-disorder transition temperature from the B2 to the L21 phase, TtB 2 / L 21, linearly increases with increasing x and the magnetic properties depend on the annealing conditions. Especially in the Ni2Mn(Ga0.5Al0.5) alloy, the condition of the atomic order can be varied from a B2 to an L21 structure by the annealing temperature. The magnetic property of the fully ordered L21 phase is ferromagnetic with a Curie temperature TC of about 380 K, while that in the B2 phase is antiferromagnetic with the Néel temperature TN of about 300 K.

Original languageEnglish
Pages (from-to)4789-4797
Number of pages9
JournalActa Materialia
Volume56
Issue number17
DOIs
Publication statusPublished - 2008 Oct

Keywords

  • Heusler phases
  • Magnetic properties
  • Microstructure
  • Nickel alloys
  • Order-disorder phenomena

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Polymers and Plastics
  • Metals and Alloys

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