日本金属学会誌

J. Japan Inst. Metals, Vol. 52, No. 3 (1988),
pp. 251-258

Magnetic Properties of Amorphous Fe-Nd Alloys

Katsuhisa Nagayama1, Hiromitsu Ino2, Kiiti Siratori3, Naoaki Saito4, Yasuaki Nakagawa5 and Eiji Kita6

1Institute of Industrial Science, University of Tokyo, Tokyo. Present address: Faculty of Engineering, University of Tokyo, Tokyo
2Institute of Industrial Science, University of Tokyo, Tokyo. Present address: Faculty of Engineering, University of Tokyo, Tokyo
3Faculty of Science, Osaka University, Osaka
4Graduate Student, Tohoku University, Sendai
5Institute for Materials Reseach, Tohoku University, Sendai
6Institute of Applied Physics, University of Tsukuba, Tsukuba

Abstract:

Single amorphous phase was obtained in Fe1-xNdx alloys by melt-spinning in a composition range of 0.11≤x≤0.60. Magnetization and Mössbauer effect were measured for these alloys.
The internal magnetic field of 57Fe nuclei is about 2.4 MA/m(300 kOe) at 77 K, being independent of composition. It suggests that the average magnetic moment of Fe atoms is nearly constant: \barμFe~eq2.0 μ B/atom. On the contrary, the average magnetic moment of Nd atoms, calculated from the results of the magnetization measurements and the above estimation of \barμFe, decreases with increasing Nd concentration: \barμNd=3.2 μ B/atom at x=0.15, which agrees with the free Nd3+ ion moment of 3.3 μ B/atom and \barμNd=1.6 μ B/atom at x≥qq0.40. While the coercive field, Hc, at 4.2 K is about 160 kA/m(2 kOe) for x=0.20, it increases abruptly for x>0.25 and becomes 5.6 MA/m(70 kOe) for x=0.55. These results can be explained by large random magnetic anisotropy of Nd atom in the amorphous alloys.


(Received 1987/9/16)

Keywords:

amorphous, iron-neodymium alloy, melt-spinning, magnetic properties, magnetization, Mössbauer effect, coercive field, random magnetic anisotropy


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