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

Año: 2004 vol. 354 p. 191 - 194

0921-4526

Alloys with compositions Nd60_xCxFe30Al10 (x=0, 1, 5 and 10) were processed by melt spinning at a tangential speed of 5 m/s. The as-cast ribbons were characterized by X-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 identi.ed as a m-type (or A1) metastable phase, which is reported to have a large anisotropy .eld and a relatively high saturation polarization. Interstitial C stabilizes the m-type phase and improves its average hyper.ne .eld. The magnetic measurements display an increase of coercivity and remanence with the C concentration.