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Medina, G.
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article
Magnetic phase diagram of the FexMn0.60-xAl0.40 (0.20≤x≤0.60) alloys mechanically alloyed for 48 hours
Abstract
<p>Alloys of the system Fe<sub>x</sub>Mn<sub>0.60-x</sub>Al<sub>0.40</sub>, 0.20 ≤ x ≤ 0.60, were prepared by mechanical alloying for 48 hours. The Mössbauer spectra were fitted with either a single line and a quadrupolar doublet or a single line, a quadrupolar doublet and a hyperfine field distribution (HFD), according to their hyperfine structures. Alloys with x ≤ 0.40 show a paramagnetic character at RT while those with x ≥ 0.45 are ferromagnetic with some paramagnetic sites due to the disorder. At 77 K, one can distinguish three types of alloys which display different magnetic behaviors: (i) antiferromagnetic with lower Fe concentration, (ii) paramagnetic with intermediate Fe contents and (iii) ferromagnetic with high Fe content. In the 0.40 ≤ x ≤ 0.60 composition region of the ac magnetic susceptibility X vs. T, superparamagnetic clusters appear inside the ferromagnetic matrix, as a consequence of the high Fe content and the disordered character of the samples.</p>