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Local Magnetic Structure and Magnetic Properties of Nd50Fe40Si10-xAlx Bulk Glassy Hard Magnets

Published online by Cambridge University Press:  17 March 2011

H. Chiriac ,
N. Lupu ,
R.E. Vandenberghe  and
K.V. Rao
H. Chiriac
Affiliation:
National Institute of Research and Development for Technical Physics, Iasi, RO-6600, Romania
N. Lupu
Affiliation:
National Institute of Research and Development for Technical Physics, Iasi, RO-6600, Romania
R.E. Vandenberghe
Affiliation:
Department of Subatomic and Radiation Physics, Gent University, Gent, B-9000, Belgium
K.V. Rao
Affiliation:
Department of Materials Science, Royal Institute of Technology, Stockholm, S-10044, Sweden
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Abstract

The large values over 300 kA/m at room temperature were found for the coercive field of Nd50Fe40Si10−xAlx (x = 0; 10) amorphous melt-spun ribbons and cast rods. The dependence of the coercive field on the thickness and the preparation method, namely the cooling rate, is ascribed to the existence in the amorphous matrix of very small ferromagnetic clusters, which approach of a single magnetic domain. Coercivity increases substantially up to 600 kA/m by decreasing the temperature down to 200 K, although the measurements are carried out in low fields (up to 800 kA/m). The Mässbauer spectra can be fitted to two Fe sites with magnetic moments ranging from 1.25 to 2.20νB depending on the additional element.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 644: Symposium L – Supercooled Liquid, Bulk Glassy and Nanocrystalline State of Alloys , 2000 , L8.3
Copyright
Copyright © Materials Research Society 2001

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