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Magnetic Properties of Nd-Fe-B-M (M=Si, C) Bulk Nanocomposite Magnets Prepared by the Spark Plasma Sintering Method

Published online by Cambridge University Press:  26 February 2011

Tomokazu Fukuzaki ,
Keisuke Tanaka ,
Kazue Nishimoto ,
Yuji Muro ,
Keishi Nishio  and
Ryuji Tamura
Tomokazu Fukuzaki
Affiliation:
fukuzaki@rs.noda.tus.ac.jp, Tokyo University of Sicence, Polyscale Technology Research Center, 2641, Ymazaki, Noda-shi, Chiba-ken, 278-8510, Japan
Keisuke Tanaka
Affiliation:
p_kaiza_plus1@yahoo.co.jp, Tokyo University of Science, Department of Materials Science and Technology, 2641, Yamazaki, Noda-shi, Chiba-ken, 278-8510, Japan
Kazue Nishimoto
Affiliation:
j8206701@ed.noda.tus.ac.jp, Tokyo University of Science, Department of Materials Science and Technology, 2641, Yamazaki, Noda-shi, Chiba-ken, 278-8510, Japan
Yuji Muro
Affiliation:
muro@ph.noda.tus.ac.jp, Tokyo University of Science, Department of Physics, 2641, Yamazaki, Noda-shi, Chiba-ken, 278-8510, Japan
Keishi Nishio
Affiliation:
k-nishio@rs.noda.tus.ac.jp, Tokyo University of Science, Department of Materials Science and Technology, 2641, Yamazaki, Noda-shi, Chiba-ken, 278-8510, Japan
Ryuji Tamura
Affiliation:
tamura@rs.noda.tus.ac.jp, Tokyo University of Science, Department of Materials Science and Technology, 2641, Yamazaki, Noda-shi, Chiba-ken, 278-8510, Japan
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Abstract

We have prepared Nd2Fe14B/Fe3B bulk nanocomposite magnets at the compositions of Nd4Fe77.5B18.5-xMx (M=Si, C) by substitution of other elements M for B. For the sample substituted with 1 at.%Si and sintered at 600 oC, the coercivity exhibits the highest value of 227 kA/m. It has also been found that the grain sizes of the Nd2Fe14B and the Fe3B phases depend on the ramp-up time and the reduction of the grain size leads to an increase of the coercivity. On the other hand, the samples substituted with C exhibit soft magnetic behaviors, which is attributed to the suppression of the precipitation of the Nd2Fe14B hard magnetic phase.

Keywords

magnetic propertiesnanostructuremicrostructure
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1032: Symposium I – Nanoscale Magnetic Materials and Applications , 2007 , 1032-I11-02
Copyright
Copyright © Materials Research Society 2008

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