Phase transformation and magnetic properties of ferromagnetic Cu-Mn-Ga alloys

Takuro Kushima, Koichi Tsuchiya, Yasukazu Murakami, Daisuke Shindo, Yoshikazu Todaka, Minoru Umemoto

研究成果: Article査読

4 被引用数 (Scopus)


Phase transformation, microstructure and magnetic properties were investigated for Cu-(11-14) mol%Mn-20mol%Ga. The structures of the magnetic domains were also investigated by Lorentz microscopy and electron holography. Plate-like martensite phase(ζM, ordered hcp) was observed in as-quenched Cu-12 mol%Mn-20mol%Ga. Phase transformation from ζM martensite to ζ phase(hcp) occurred at around 540K on heating. The ζ phase decomposed into ζ″ (ordered hcp) and β(bcc) phase at around 700 K, then became the single β phase at around 840 K. By subsequent slow cooling, ζ phase was observed at room temperature. The results obtained from Lorentz microscopy and electron holography revealed that the twin plates of ζM martensite and the magnetic domain have one-to-one correspondence, suggesting high magneto-crystalline anisotropy energy of the martensite phase. The saturation magnetization and the Curie temperature increased with Mn content.

ジャーナルMaterials Transactions
出版ステータスPublished - 2007 11月

ASJC Scopus subject areas

  • 材料科学(全般)
  • 凝縮系物理学
  • 材料力学
  • 機械工学


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