Magnetic studies of melt spun NdFeAl–C alloys

✍ Scribed by C.E. Rodríguez Torres; A.F. Cabrera; F.H. Sánchez; O.V. Billoni; S.E. Urreta; L.M. Fabietti

• Publisher: Elsevier Science
• Year: 2004
• Tongue: English
• Weight: 525 KB
• Volume: 354
• Category: Article
• ISSN: 0921-4526
• DOI: 10.1016/j.physb.2004.09.046

✦ Synopsis

Alloys with compositions Nd 60Àx C x Fe 30 Al 10 (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 identified as a m-type (or A1) 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.