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Nd Rich Nd-Fe-B Tailored for Maximum Coercivity

Published online by Cambridge University Press:  21 February 2011

Er. Girt,
Kannan M. Krishnan,
G. Thomas,
C. J. Echer and
Z. Altounian
Er. Girt
Affiliation:
Material Science Division, Lawrence Berkeley National Laboratory, University of California, Berkeley, California 94720, EGirt@lbl.gov
Kannan M. Krishnan
Affiliation:
Material Science Division, Lawrence Berkeley National Laboratory, University of California, Berkeley, California 94720
G. Thomas
Affiliation:
Material Science Division, Lawrence Berkeley National Laboratory, University of California, Berkeley, California 94720
C. J. Echer
Affiliation:
Material Science Division, Lawrence Berkeley National Laboratory, University of California, Berkeley, California 94720
Z. Altounian
Affiliation:
Centre for the Physics of Materials, Department of Physics, McGill University, Montreal, Quebec, Canada
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Abstract

The coercive field, He, in rapidly quenched Nd-Fe-B was found to increase for samples with excess of Nd. In addition, Hc, strongly depends on the Fe/B ratio, increasing from 1.67 T for Fe/B = 1.07 to 2.05 T for Fe/B = 14.6 in Nd30(Fe,B)70. The increase in Hc seems to correlate with an increase of the γ-Nd phase in the sample. The initial magnetization curves of Nd30(Fe,B)70 show that the domain wall pinning plays a more important role as the Fe/B ratio increases. Thus, γ-Nd may play an important role in promoting a pinning mechanism. The excess of Nd in rapidly quenched Nd-Fe-B samples was also found to promote growth of Nd2Fe14B grains elongated in shape.

Information

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 577: Symposium H – Advanced Hard and Soft Magnetic Materials , 1999, 247
Copyright
Copyright © Materials Research Society 1999

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References

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