Effect of cobalt substitution on structure and magnetic properties of Nd_0.4Zr_0.6Fe_10-xCo_xSi₂£¨x =0-3£© alloys and their ribbons

M.Gjoka^1,2£¬C.Sarafidis³£¬G.Giannopoulos¹£¬D.Niarchos¹£¬G.Hadjipanayis²£¬J.A.Tabares⁴£¬G.A.P¨¦rez Alc¨¢zar⁴£¬L.E.Zamora⁴

1. Institute of Nanoscience and Nanotechnology,NCSR Demokritos2. Department of Physics and Astronomy, University of Delaware3. Department of Physics, Aristotle University of Thessaloniki4. Departamento de F¨ªsica, Universidad del Valle

Õª Òª£ºThis study reports the stabilization of the RFe₁₂-type based compounds where part of R and Fe are substituted with Zr and Co and Si, respectively, in order to examine whether these rare-earth-lean materials are suitable for applications as permanent magnets. Structural and magnetic characterization of the family of alloys with the general formula Nd_0.4 Zr_0.6 Fe_10-xCo_xS_i2£¨x = 0 -3£© and their melt-spun ribbons were carried out using X-ray diffraction and M€ossbauer spectroscopy. The ThMn₁₂-type structure is obtained for all samples as the majority phase with a minority a-Fe£¨CoSi£© phase£¨less than 5 wt%£© as it was estimated by XRD for x = 1 and 2. The Curie temperature increases linearly with Co substitution from 561 K for x = 0 to 712 K for x = 3. The saturation magnetization decreases slightly from 130.5£¨x =1£©to 129.1 A¡¤m²/kg£¨x=3£©, while the anisotropy field is following the same trend.

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