Abstract
Mossbauer spectra have been measured for two Fe-rich amorphous alloys, a -Fe 91.5 La 8.5 with spin glass behavior and a -Fe 82.5 La 17.5 with reentrant spin glass behavior, in the temperature range between 4.2 K and room temperature. These spectra are analyzed using the Hesse and Rubertsch method to obtain the distribution of hyperfine fields. The distribution of hyperfine fields at 4.2 K consists of a main component ranging from 200 kOe to 400 kOe and a sub-component around 150 kOe. The average Fe-moment is estimated to be 1.96µ B for a -Fe 91.5 La 8.5 and 2.00µ B for a -Fe 82.5 La 17.5 . Hyperfine fields in a -Fe 91.5 La 8.5 appear progressively below 150 K, which is apparently higher than the spin glass temperature of 124 K determined by the ac susceptibility measurement. On the other hand, hyperfine fields in a -Fe 82.5 La 17.5 appear just below the ferromagnetic ordering temperature of 267.5 K, but increase anomalously below 70 K. This anomaly can be explained in terms of the freezing of transverse c...
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