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Synthesis and magnetic properties of Fe51Pt27Nb2B20 melt spun ribbons

A. D. CRISAN1, O. CRISAN1,* , I. SKORVANEK2, N. RANDRIANANTOANDRO3

Affiliation

  1. National Institute for Materials Physics, P.O. Box MG-7, 077125 Bucharest-Magurele, Romania
  2. Institute of Experimental Physics, Slovak Academy of Sciences, 040-01 Kosice, Slovakia
  3. Laboratoire de Physique de l’Etat Condense, UMR 6034 CNRS, Universite du Maine, 72000 Le Mans, France

Abstract

Fe-Pt alloys have gained much interest for the occurrence of permanent magnetic features resulting from the L10 ordered face-centred-tetragonal FePt phase with very high magnetic crystalline anisotropy (7x106 J/m3). An amorphous melt spun ribbons of the composition Fe51Pt27Nb2B20 has been synthesized by the rapid solidification technique and its microstructure and magnetic properties were studied. After appropriate annealing, an ordered face-centred-tetragonal (f.c.t.) L10 phase is formed. X-ray analysis revealed a structural phase transformation from the body-centered-cubic A1 to f.c.t. L10 phase and this produce magnetic hardening of the alloy, upon appropriate annealing conditions. Extremely performant magnetic properties, typical for exchange spring magnets, are obtained..

Keywords

Structural phase transformations, Fe-Pt alloys, Nanocomposite magnets, Melt spun ribbons, Fe-Pt-Nb-B.

Submitted at: Feb. 25, 2008
Accepted at: April 4, 2008

Citation

A. D. CRISAN, O. CRISAN, I. SKORVANEK, N. RANDRIANANTOANDRO, Synthesis and magnetic properties of Fe51Pt27Nb2B20 melt spun ribbons, Journal of Optoelectronics and Advanced Materials Vol. 10, Iss. 4, pp. 786-789 (2008)