Enhanced energy product in Y-Co-Fe magnets intermediate between Nd-Fe-B and ferrite


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Tozman P., Venkatesan M., Zickler G. A. , Fidler J., Coey J. M. D.

APPLIED PHYSICS LETTERS, vol.107, no.3, 2015 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 107 Issue: 3
  • Publication Date: 2015
  • Doi Number: 10.1063/1.4927306
  • Journal Name: APPLIED PHYSICS LETTERS
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Hacettepe University Affiliated: No

Abstract

The hysteresis of ball-milled Fe-doped YCo5 powder has been optimized by controlling the temperature and time for rapid annealing under vacuum and argon. The crystallite size is only 25 nm; yet, it has been possible to field align Y(Co, Fe) powder with a 5-20 mu m grain size in a 5 T field to obtain a remanence ratio of 0.65, due to texture in the ball-milled powder. The nominal energy product of the powder is 140 kJ/m(3). A pressed magnet with 78% of theoretical density has an energy product of 65 kJ/m(3). This magnet could fill the gap between oriented ferrite (34 kJ/m(3)) and oriented Nd-Fe-B (350 kJ/m(3)). (C) 2015 AIP Publishing LLC.