Magnetic phase transition of MnBi under high magnetic fields and high temperature

Keiichi Koyama, Tetsuya Onogi, Yoshifuru Mitsui, Yuko Nakamori, Shin Ichi Orimo, Kazuo Watanabe

Research output: Contribution to journalArticle

26 Citations (Scopus)

Abstract

Magnetization measurements and differential thermal analysis (DTA) of poly crystalline MnBi were carried out in magnetic fields up to 14 T and in 300-773 K, in order to investigate the magnetic phase transition. The magnetic phase transition temperature (Tt) at a zero magnetic field is 628 K and linearly increases with increasing fields up to 14 T at the rate of 2 KT- '. A metamagnetic transition between the paramagnetic and field-induced ferromagnetic states was observed just above Tt. The exothermic and endothermic peaks were detected in the magnetic field dependence of DTA signals in 626-623 K, which relates to the metamagnetic transition. The obtained results were discussed on the basis of a mean field theory.

Original languageEnglish
Pages (from-to)2414-2418
Number of pages5
JournalMaterials Transactions
Volume48
Issue number9
DOIs
Publication statusPublished - 2007 Sep 1

Keywords

  • Differential thermal analysis
  • First order transition
  • High magnetic field
  • Metamagnetic transition
  • MnBi compound

ASJC Scopus subject areas

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

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