Spin glass behavior of mechanically alloyed fcc-(Fe79Mn21)1-xCux, (0.00  x  0.30).

M. MIZRAHI; A. F. CABRERA; J. DESIMONI.

JOURNAL OF APPLIED PHYSICS

AMER INST PHYSICS

Lugar: American Institute of Physics; Año: 2010 vol. 107 p. 443111 - 4431110

0021-8979

The structural, hyperfine, and magnetic properties of mechanically milled alloys of
Fe79Mn211−xCux
x from 0.00 to 0.30 have been characterized by x-ray diffraction
XRD, extended x-ray absorption fine structure spectroscopy
EXAFS, Mössbauer spectroscopy, and ac susceptibility measurements. XRD and EXAFS results indicated that Cu addition favored the formation of a Fe–Mn–Cu random solid solution with fcc structure. The lattice parameter exhibited linear dependence on the Cu content, which is compatible with the larger atomic radii of the Cu atoms when compared with the Mn or the Fe ones. The dependence of Mössbauer hyperfine parameters on the Cu content at room temperature is coherent with the formation of a ternary phase. The ac susceptibility curves jointly with the Mössbauer results are representative of a spin-glass-like system.