Structural and magnetic study of nanostructured (Fe 79Mn21)80Cu20 alloy synthesized by ball milling

M. MIZRAHI; A. F. CABRERA; SILVANA JACQUELINE STEWART; H. E. TROIANI; S. M. COTES; J. DESIMONI

Physica B - Condensed Matter

Año: 2004 vol. 354 p. 133 - 136

0921-4526

We have obtained by high-energy ball milling of the powder elements, a nanostructured (Fe79Mn21)80Cu20 FCC with a grain size distribution of an average crystallite size of 8 nm. Mo¨ ssbauer spectroscopy, AC-susceptibility and magnetization measurement results indicate that the FCC alloy displays two magnetic behaviors; a paramagnetic component that orders along over a wide temperature range below 220 K, and a minor antiferromagnetic fraction thatis still ordered at room temperature. The average hyperfine field (Bhf=5.2 T) and the isomer shift (d=0.07mm/s) values at T=23K show that Fe atoms are in a FCC structure that includes Mn and Cu atoms. In addition, we verified that presence of Cu stabilizes the FCC-Fe(Mn,Cu) phase.