Abstract
We report results of57Fe Mössbauer measurements on the magnetically concentrated re-entrant amorphous Fe100−xZr x alloys (8≤x≤12) which give convincing evidence for a microscopic origin of the low-temperature magnetization anomaly atT f<T c. This is shown by an anomalous increase in the magnetic hyperfine field and in the relative intensities of the (†m=0)-Mössbauer lines belowT f upon cooling. No evidence was found for an antiferromagnetic phase. The shape of the hyperfine-field distribution atT=4.2 K in zero external field and in a field of 3 T is unchanged, indicating homogeneous behaviour of all Fe moments near saturation. Ferromagnetic order is not long-ranged, but determined by exchange-coupled magnetic clusters. The cluster moment nearT c is found to decrease strongly with increasing Fe content and extrapolates to zero atx≈96.
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Ghafari, M., Chmielek, N., Keune, W. et al. Re-entrant magnetic behaviour in amorphous Fe-rich Fe100−x Zr x alloys. Hyperfine Interact 54, 527–531 (1990). https://doi.org/10.1007/BF02396084
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DOI: https://doi.org/10.1007/BF02396084