Magnetic studies of melt spun NdFeAl-C alloys

C. E. RODRÍGUEZ TORRES; A. F. CABRERA; F. H. SÁNCHEZ; O. V. BILLONI; S. E. URRETA; L. M. FABIETTI

PHYSICA B - CONDENSED MATTER

Elsevier

Lugar: Amsterdam; Año: 2004 vol. 354 p. 191 - 194

0921-4526

Alloys with compositions Nd60xCxFe30Al10 (x=0,1,5and10) were processed by melt spinning at a tangential speed of 5m/s.The as-cast ribbons were characterized byX-ray diffraction, Mo¨ssbauer Effect spectroscopy and their room temperature hysteresis loops. The substitution of Nd by C is found to affect the phase selection, from mainly DHCP-Nd for x=0 to DHCP-Nd/FCC-Nd for the other ones. Mo¨ssbauer spectra of all the as-cast samples indicate that Fe is present in crystalline magnetic phases as well as in a paramagnetic one. The major crystalline phase was identified as a m-type  (orA1) metastable phase, which is reported to have a large anisotropy field and a relatively high saturation polarization. Interstitial C stabilizes the m-type phase and improves its average hyperfine field. The magnetic measurements display an increase of coercivity and remanence with the C concentration