Structure and Magnetic Properties of Cu Doped MnAl
H. X. Wang
Zhejiang Key Lab of Magnetic Materials, China Jiliang University, Hangzhou 310018, China
P. Z. Si *
Zhejiang Key Lab of Magnetic Materials, China Jiliang University, Hangzhou 310018, China
W. Jiang
Zhejiang Key Lab of Magnetic Materials, China Jiliang University, Hangzhou 310018, China
X. F. Xiao
Zhejiang Key Lab of Magnetic Materials, China Jiliang University, Hangzhou 310018, China
J. G. Lee
Korea Institute of Materials Science, Changwon, Gyeongnam, 641-831, Korea
C. J. Choi
Korea Institute of Materials Science, Changwon, Gyeongnam, 641-831, Korea
M. Zhong
Zhejiang Key Lab of Magnetic Materials, China Jiliang University, Hangzhou 310018, China
Z. F. Li
Zhejiang Key Lab of Magnetic Materials, China Jiliang University, Hangzhou 310018, China
H. L. Ge
Zhejiang Key Lab of Magnetic Materials, China Jiliang University, Hangzhou 310018, China
*Author to whom correspondence should be addressed.
Abstract
The effects of Cu-doping and heat-treatment on the structure and magnetic properties of ô-MnAl have been investigated. Copper stabilizes the structure of ô-MnAl and enhances the fraction of ô-phase while excess Cu (≥9 atm%) results in the formation of more ã- and/or â-phase. In comparison with the binary Mn-Al system, the Cu-doped ternary alloy is more insensitive to heat-treatment in structural transformation. Cu-doping usually decreases the saturation magnetization while a certain amount of Cu enhances the coercivity of the samples. The annealing time and temperature have a substantial effect on the magnetic properties of MnAl.
Keywords: Magnetic properties, MnAl, structure, Cu substitution