Field induced structural transformation in MnAs

Fumihiro Ishikawa, Keiichi Koyama, Kazuo Watanabe, Hirofumi Wada

Research output: Contribution to journalLetterpeer-review

34 Citations (Scopus)


The structural phase transition induced by magnetic fields on the ferromagnetic compound MnAs was observed by the X-ray diffraction measurements in high magnetic fields up to 4 T. Magnetization measurements showed that Curie temperature TC was 315.5 K for increasing temperatures and a metamagnetic transition from the paramagnetic to the ferromagnetic state occurred above TC. The structural transformation from the hexagonal NiAs-type to the orthohombic MnP-type structure was confirmed at TC with increasing temperature from 290 K. The X-ray profiles at 319 K in the magnetic field showed that the hexagonal structure phase appeared with increasing fields and coexisted with the orthorhombic one. On further increase of magnetic fields, the single phase of the hexagonal structure was observed above 3.5 T in the forced ferromagnetic state. Both the magnetic and structural transitions induced by magnetic fields above TC were first order with a hysteresis and had a close relationship between each other.

Original languageEnglish
Pages (from-to)L918-L920
JournalJapanese Journal of Applied Physics, Part 2: Letters
Issue number8 A
Publication statusPublished - 2003 Aug 1
Externally publishedYes


  • Metamagnetic transition
  • MnAs
  • Structural transformation
  • X-ray diffraction

ASJC Scopus subject areas

  • Engineering(all)
  • Physics and Astronomy(all)


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