Magnetic Field-Induced Transition in Co-Doped Ni₄₁Co₉Mn_31.5Ga_18.5 Heusler Alloy

• Sakon Takuo

  Department of Mechanical and Systems Engineering, Faculty of Science and Technology, Ryukoku University

• Sasaki Kenta

  Department of Mechanical Engineering, Graduate School of Engineering and Resource Science, Akita University

• Numakura Daisuke

  Department of Mechanical Engineering, Graduate School of Engineering and Resource Science, Akita University

• Abe Michihito

  Department of Mechanical Engineering, Graduate School of Engineering and Resource Science, Akita University

• Nojiri Hiroyuki

  Institute for Materials Research, Tohoku University

• Adachi Yoshiya

  Faculty of Engineering, Yamagata University

• Kanomata Takeshi

  Research Institute for Engineering and Technology, Tohoku Gakuin University Department of Materials Research, Graduate School of Engineering, Tohoku University

Bibliographic Information

Other Title

• Magnetic Field-Induced Transition in Co-Doped Ni₄₁Co₉Mn₃₁.₅Ga₁₈.₅ Heusler Alloy

Abstract

Thermal strain, magnetostriction and magnetization measurements of Ni₄₁Co₉Mn_31.5Ga_18.5 polycrystalline ferromagnetic shape memory alloy (FSMA) were performed across the martensitic transition temperature, T_M, and the reverse martensitic transition temperature, T_R, at atmospheric pressure. When cooling from the austenite phase, a steep decrease in thermal expansion due to the martensitic transition at T_M was found. When heating from the martensitic phase, a steep increase in the thermal expansion due to the reverse martensitic transition at T_R was observed. These transition temperatures decreased gradually with increasing magnetic field. The field dependence of the martensitic transition temperature, dT_M/dB, is −4.2 K/T and that of the reverse martensitic transition temperature, dT_R/dB, is −7.9 K/T. The metamagnetic transition appeared between 330 and 390 K. The results of thermal strain and magnetization measurements indicate that a magneto-structural transition occurred at T_M. The region above T_M or T_R is the ferromagnetic austenite phase and that below T_M or T_R is the paramagnetic or weak ferromagnetic martensitic phase. At constant temperature, a magnetic field-induced strain was observed with a value of 1.0 × 10⁻³, which indicates that this alloy is sensitive to magnetic fields. Strong magneto-structural coupling was revealed by the magnetic properties and phase transitions.

Journal

• MATERIALS TRANSACTIONS

  MATERIALS TRANSACTIONS 54 (1), 9-13, 2013

  The Japan Institute of Metals and Materials

Keywords

• shape memory alloys
• thermal expansion
• magnetization
• magnetostriction

Details

• CRID: 1390282679226715264
• NII Article ID: 10031144450
• NII Article ID: 130004824979
• NII Book ID: AA1151294X
• DOI: 10.2320/matertrans.m2012289
• ISSN: 13475320
• ISSN: 13459678
• NDL BIB ID: 024164152
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I024164152
• Web Site: https://www.jstage.jst.go.jp/article/matertrans/54/1/54_M2012289/_pdf
• Text Lang: en
• Data Source:
  • JaLC
  • NDL
  • Crossref
  • CiNii Articles
  • KAKEN
• Abstract License Flag: Disallowed