Temperature evolution of frustrated spin states in the system with competing exchange interactions (Fe0.65Ni0.35)(1-x)Mn-x (x=0, 0.024, 0.034)статья
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Аннотация:The influence of temperature on the distribution function P(B-hf) of the magnetic hyperfine fields for Fe-57 in (Fe0.65Ni0.35)(1-x)Mn-x alloys (x = 0, 0.024, 0.034) are investigated by Mossbauer spectroscopy. The Mossbauer absorption spectra are measured in the temperature interval 5-300 K; in the interval 5-80 K the measurements are performed in a magnetic field of 0.2 T. Anomalies are found in the temperature curves of the intensity of the principal maximum of the functions P(B-hf)[B-hf = 30-38 T] and the total (integrated) intensities of the low-field components [B-hf = (4-13) T]. The detected anomalies in the behavior of the total intensities are interpreted as resulting from a change in the balance of competing exchange interactions due to the thermal annihilation of antiferromagnetic Fe-Fe exchange interaction. The emergence of strong satellite lines in the interval B-hf = 20-29 T in Mn-doped alloys is attributed to reorientation of the spins of Fe atoms under the influence of strong antiferromagnetic Mn-Fe exchange interaction. (C) 1998 American Institute of Physics. [S1063-7834(98)01809-7].