Simultaneous magnetooptic observation and thermomagnetic analysis of phase transitions in shape-memory Ni-Mn-Ga alloys

Oleg M. Korpusov, Rostislav M. Grechishkin, Victor V. Koledov, Victor V. Khovailo, T. Takagi, Vladimir G. Shavrov

Research output: Contribution to journalArticle

14 Citations (Scopus)

Abstract

Direct observations of the austenite and martensite twin and magnetic domain structures are combined with thermomagnetic analysis (low-field AC susceptibility temperature measurements) of phase transitions in ferromagnetic shape memory alloys Ni2+xMn1-x Ga. Thermal hysteresis and magnetization jumps are clearly resolved by both techniques. Large Barkhausen-like jumps associated with discontinuous phase boundary and martensite twin motion are observed during the austenite-martensite transformation in contrast to the smooth ferromagnetic-paramagnetic transition near the Curie temperature.

Original languageEnglish
Pages (from-to)2035-2037
Number of pages3
JournalJournal of Magnetism and Magnetic Materials
Volume272-276
Issue numberIII
DOIs
Publication statusPublished - 2004 May

Keywords

  • Barkhausen effect
  • Magnetic domain structure
  • Shape memory alloy

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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