Magnetic Moment of Cu-Modified Ni2MnGa Magnetic Shape Memory Alloys

Metals

Takeshi Kanomata⁵  Keita Endo⁴  Naoto Kudo⁴  Rie Y. Umetsu⁶  Hironori Nishihara¹  Mitsuo Kataoka³  Makoto Nagasako²  Ryosuke Kainuma² 

[1] Faculty of Science and Technology, Ryukoku University, Otsu 520-2194, Japan; E-Mail:;Department of Materials Science, Graduate School of Engineering, Tohoku University, Sendai 980-8579, Japan; E-Mails:;Department of Basic Sciences, Faculty of Science and Engineering, Ishinomaki Senshu University, Ishinomaki 986-8580, Japan; E-Mail:;Faculty of Engineering, Tohoku Gakuin University, Tagajo 985-8537, Japan; E-Mails:;Research Institute for Engineering and Technology, Tohoku Gakuin University, Tagajo 985-8537, Japan; E-Mail:;Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan

关键词: magnetic shape memory alloy;    Heusler alloy;    Ni₂MnGa;    magnetic moment;   

DOI  :  10.3390/met3010114

来源: mdpi

【 摘 要 】

The magnetization measurements at 5 K were carried out for Ni₂Mn_{1 − x}Cu_xGa (0 ≤ x ≤ 0.40) and Ni₂MnGa_{1 − y}Cu_y (0 ≤ y ≤ 0.25) alloys. All of the magnetization curves are characteristic of ferromagnetism or ferrimagnetism. By using Arrott plot analysis the spontaneous magnetization of all samples was determined from the magnetization curves. The magnetic moment per formula unit, μ_s, at 5 K was estimated from the spontaneous magnetization. For Ni₂Mn_{1 − x}Cu_xGa (0 ≤ x ≤ 0.40) alloys μ_s at 5 K decreases linearly with increasing x. On the other hand, the μ_s at 5 K for Ni₂MnGa_{1 − y}Cu_y (0 ≤ y ≤ 0.25) alloys decreases more steeply with increasing x compared to the μ_s for Ni₂Mn_{1 − x}Cu_xGa (0 ≤ x ≤ 0.40) alloys. On the basis of the experimental results, the site-occupation configurations of Ni₂Mn_{1 − x}Cu_xGa (0 ≤ x ≤ 0.40) and Ni₂MnGa_{1 − y}Cu_y (0 ≤ y ≤ 0.25) alloys are proposed.

【 授权许可】

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