Magneto-Structural Properties of Ni2MnGa Ferromagnetic Shape Memory Alloy in Magnetic Fields

Metals

Takuo Sakon²  Yoshiya Adachi¹ 

[1] Graduated School of Science and Engineering, Yamagata University, Yonezawa 992-8510, Japan; E-Mail:;Department of Mechanical and Systems Engineering, Faculty of Science and Technology, Ryukoku University, Otsu 520-2194, Japan

关键词: ferromagnetic shape memory alloys;    magnetocrystalline anisotropy;    thermal strain;    magnetic field-induced strain;    magnetostriction;   

DOI  :  10.3390/met3020202

来源: mdpi

【 摘 要 】

The purpose of this review was to investigate the correlation between magnetism and crystallographic structures as it relates to the martensite transformation of Ni₂MnGa type alloys, which undergo martensite transformation below the Curie temperature. In particular, this paper focused on the physical properties in magnetic fields. Recent researches show that the martensite starting temperature (martensite transformation temperature) T_M and the martensite to austenite transformation temperature (reverse martensite temperature) T_R of Fe, Cu, or Co-doped Ni–Mn–Ga ferromagnetic shape memory alloys increase when compared to Ni₂MnGa. These alloys show large field dependence of the martensite transformation temperature. The field dependence of the martensite transformation temperature, dT_M/dB, is −4.2 K/T in Ni₄₁Co₉Mn₃₂Ga₁₈. The results of linear thermal strain and magnetization indicate that a magneto-structural transition occurred at T_M and magnetic field influences the magnetism and also the crystal structures. Magnetocrystalline anisotropy was also determined and compared with other components of Ni₂MnGa type shape memory alloys. In the last section, magnetic field-induced strain and magnetostriction was determined with some novel alloys.

【 授权许可】

CC BY   
© 2013 by the authors; licensee MDPI, Basel, Switzerland.