Abstract
The magnetic moment, Curie temperature and Invar effects in amorphous alloys are briefly reviewed. The average magnetic moment μ of binary amorphous alloys of Fe, Co, and Ni with an early transition metal E shows a systematic trend, that is, the value of μ becomes larger as the valence and size differences between Fe, Co, Ni and E increase. Comparison of the experimental results with Friedel's model suggests that Co-E alloys exhibit strong ferromagnetism while Fe-E alloys present weak ferromagnetism. The concentration dependence of the Curie temperature T <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">c</sub> is similar to that of μ above 20% E in Fe-E alloys. However, in the dilute concentration range, T <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">c</sub> decreases very rapidly, resulting in spin glass behavior due to spin frustration. Invar effects such as a large thermal expansion anomaly and a remarkable pressure effect on T <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">c</sub> are common in Fe-based amorphous alloys. The anomalous behavior above T <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">c</sub> is closely related to magnetic inhomogeneity.
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