Magnetic and structural phase transitions in ferromagnetic MnBi

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

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

X-ray powder diffraction, magnetization measurements, and differential thermal analysis (DTA) of polycrystalline MnBi were carried out in zero magnetic field as will as in magnetic fields of up to 14 T and in the temperatures range of 300-773 K, in order to investigate magnetic phase transition. In zero magnetic field, a magnetic phase transition from ferromagnetic to paramagnetic state is exhibited at temperature (T t) of 628 K, accompanied by decomposition. With increasing magnetic field up to 14 T, T t increases linearly with the rate of 2 KT -1. A metamagnetic transition between the paramagnetic and field-induced ferromagnetic states was observed just above T t. The exothermic and endothermic peaks were detected in the magnetic field dependence of DTA signals in the interval of 626-623 K, which relates to the metamagnetic transition. The obtained results are discussed on the basis of a mean field theory.

Original languageEnglish
Pages (from-to)40-45
Number of pages6
JournalNippon Kinzoku Gakkaishi/Journal of the Japan Institute of Metals
Volume73
Issue number1
DOIs
Publication statusPublished - 2009 Jan 1

Keywords

  • First order phase transiton
  • High magnetic field
  • Metamagnetic transition
  • MnBi
  • Thermal analysis

ASJC Scopus subject areas

  • Mechanics of Materials
  • Materials Chemistry
  • Metals and Alloys
  • Condensed Matter Physics

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