Studies on the exchange and dipolar couplings in Nd2Fe14B/α-Fe-Reference-Cited by-同舟云学术

Studies on the exchange and dipolar couplings in Nd2Fe14B/α-Fe

Published:2008-01-01 Issue:1 Volume:99 Page:70-74
ISSN:2195-8556
Container-title:International Journal of Materials Research
language:en
Short-container-title:

Author:

Joseyphus R. Justin¹²,Narayanasamy A.¹,Varga L. K.³,Jeyadevan B.²

Affiliation:

1. University of Madras, Materials Science Centre, Chennai, India

2. Tohoku University, Graduate School of Environmental Studies, Sendai, Japan

3. Hungarian Academy of Sciences, Research Institute for Solid State Physics and Optics, Budapest, Hungary

Abstract

Abstract The exchange coupling between Nd2Fe14B/α-Fe phases is investigated for Nd10Fe85B5 and Nd11Fe80B9 melt spun ribbons. The exchange coupling is present in Nd10Fe85B5 ribbons when the grain size of the α-Fe phase is as high as 30 nm due to better inter-grain interaction. The exchange coupling is enhanced when the exchange length increases due to the reduction in the value of magnetocrystalline anisotropy constant which is verified by δM measurements at various temperatures. The as-spun nanocomposite ribbons show both exchange and dipolar couplings, whereas annealing results in an increase in the strength of the exchange coupling due to the removal of grain boundary anisotropy as demonstrated from δM studies.

Publisher

Walter de Gruyter GmbH

Subject

Materials Chemistry,Metals and Alloys,Physical and Theoretical Chemistry,Condensed Matter Physics

Link

https://www.degruyter.com/document/doi/10.3139/146.101597/pdf

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