Magnetic properties of ferromagnetic shape memory alloys Ni_{2-x}Cu_{x}MnGa

Issue title: INABIO 2004

Article type: Research Article

Authors: Kanomata, Takeshi^{a; *} | Nozawa, Takuji^a | Kikuchi, Daisuke^a | Nishihara, Hironori^b | Koyama, Keiichi^c | Watanabe, Kazuo^c

Affiliations: [a] Faculty of Engineering, Tohoku Gakuin University, Tagajo, 985-8537, Japan | [b] Faculty of Science and Technology, Ryukoku University, Otsu, 520-2123, Japan | [c] Institute for Materials Research, Tohoku University, Sendai, 980-8577, Japan

Correspondence: [*] Corresponding author. Fax: +81 22 368 7070; E-mail: [email protected]

Abstract: Magnetic measurements on Ni_{2-x}Cu_{x}MnGa with 0 ≦ x ≦ 0.8 are made in the temperature range between 4.2 K and 440 K. A phase diagram of Ni_{2-x}Cu_{x}MnGa is determined from the results of the temperature dependence of the initial permeability. The Curie temperature T_{C} increases with the Cu concentration x. The martensitic and reverse martensitic transformation temperatures decrease abruptly with x. It is deduced that the substitution for Ni by Cu in Ni_{2}MnGa promotes to localize the magnetic moment of Mn atom.

Keywords: Ni[TeX:] _{2-x}Cu[TeX:] _{x}MnGa, ferromagnetic shape memory alloy, phase diagram, magnetic moment, phase transformation

DOI: 10.3233/JAE-2005-679

Journal: International Journal of Applied Electromagnetics and Mechanics, vol. 21, no. 3-4, pp. 151-157, 2005