Magnetic order in Cr73.7(Fe0.83Mn0.17)26.3 alloy
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The sample is magnetically heterogeneous. Above Tc, the PM phase is dominant in the alloy. But in this temperature range, the M-Ba plot is still curved andthe external field dependence of the internal field was also observed in the in-field Mössbauer measurements. It implies that there are magnetically coupled clusters in the sample. These clusters may behave superparamagnetically in the alloy. So they did not cause the change of the line width of the Mössbauer spectra without external field. The magnetic moments of the clusters can be polarized by external field, which causes the curvature of M-Ba plot and the external field dependence of the internal field.
Below Tc, some PM phase persists down to 50 K at least. The clusters with very low Tc or even coupled antiferromagnetically at low temperatures are responsible for the PM phase in this temperature range.
At 50 K, the FM phase is dominant whereas some magnetic moments are coupled antiferromagnetically in the alloy.
At a freezing temperature of about 25 K, the re-entrant spin glass behavior can be observed in the alloy.
It can be concluded that the short-range chemical order plays a dominant role in this kind of magnetic order in this alloy. Our results are favorable for the first picture given above which explains the mechanism of re-entrant spin glass behavior.
KeywordsMössbauer spectrum magnetic order clusters re-entrant spin glass
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