Abstract
Several kinds of FeCe amorphous alloys were prepared by high-rate dc sputtering in order to investigate their magnetic properties. The coercive force at 4.2 K is very small as that of FeZr amorphous alloys, suggesting that Ce atoms do not have large magnetic moment due to the valence fluctuation, that is, a tetravelent character. The magnetic cooling curves and the temperature dependence curves of ac susceptibility reveal that the FeCe amorphous alloy system shows a spin glass behavior in a wide concentration range in a similar manner as the FeLu amorphous alloy systems. The Curie temperature is much lower than that of FeLa and FeZr amorphous alloy systems. The room temperature densities in the crystalline and amorphous phases at the Laves phase composition are much larger than the value expected from Vegard's law due to the valence fluctuation of Ce.
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