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Investigations on the Magnetic Properties of High-Coercivity Nd40Fe30Co15Al10B5 Bulk Amorphous Alloys

Published online by Cambridge University Press:  01 February 2011

L. Bessais ,
C. Djëga-Mariadassou  and
N. X. Phuc
L. Bessais
Affiliation:
LCMTR, UPR209, CNRS, 2/8 rue Henri Dunant, B.P. 28 F-94320 Thiais, France IUFM de Crëteil, F-94861 Bonneuil sur Marne, France
C. Djëga-Mariadassou
Affiliation:
LCMTR, UPR209, CNRS, 2/8 rue Henri Dunant, B.P. 28 F-94320 Thiais, France
N. X. Phuc
Affiliation:
Institute of Materials Science, NCST, Hoang Quoc Viet Road, Viet Nam.
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Abstract

Nd40Fe30Co15Al10B5 bulk amorphous prepared by high energy milling shows a coercivity of 8.1 kOe with a Curie temperature of 645 K. The controlled nanocrystallization enhances the coercivity to 20 kOe and the remanence ratio is equal to 0.59. The coexistence of two crystalline magnetic phases, ferromagnetic Nd2(Fe,Co,Al)14B and antiferromagnetic Nd6(Fe,Co,Al)14 are revealed by x-ray diffraction, high-resolution transmission electron microscopy, magnetization measurements, and Mössbauer spectrometry. The grain size for optimal magnetic properties is around 30 nm. The nucleation process may play a leading role in the high magnetic behavior.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 877: Symposium S – Magnetic Nanoparticles and Nanowires , 2005 , S6.22
Copyright
Copyright © Materials Research Society 2005

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