Magnetic phase diagram of the FexMn0.60-xAl0.40 (0.20≤x≤0.60) alloys mechanically alloyed for 48 hours

C. González, G. Medina, J. M. Grenèche, G. A. Pérez Alcázar, S. Suriñach, J. S. Muñoz, M. D. Baró

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1 Scopus citations


Alloys of the system FexMn0.60-xAl0.40, 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.

Original languageEnglish
Pages (from-to)565-570
Number of pages6
JournalMaterials Science Forum
StatePublished - 2001
Externally publishedYes
EventMetastable, Mechanically Alloyed and Nanocrystalline Materials (ISMANAM 2000) - Oxford, United Kingdom
Duration: 9 Jul 200014 Jul 2000


  • FeMnAl alloys
  • Mechanical alloying
  • Reentrant spin glass
  • Spin glasses
  • Superparamagnetism


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