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Fe64B22.8Nd6.6Y3.9Nb2.7 bulk nanocomposite magnets with improved size and magnetic properties

Published online by Cambridge University Press:  16 December 2011

Zubair Ahmad ,
Shan Tao ,
Tianyu Ma  and
Mi Yan
Zubair Ahmad
Affiliation:
State Key Laboratory of Silicon Materials, Department of Materials Science and Engineering, Zhejiang University, Hangzhou 312007, China
Shan Tao
Affiliation:
State Key Laboratory of Silicon Materials, Department of Materials Science and Engineering, Zhejiang University, Hangzhou 312007, China
Tianyu Ma
Affiliation:
State Key Laboratory of Silicon Materials, Department of Materials Science and Engineering, Zhejiang University, Hangzhou 312007, China
Mi Yan*
Affiliation:
State Key Laboratory of Silicon Materials, Department of Materials Science and Engineering, Zhejiang University, Hangzhou 312007, China
*
a)Address all correspondence to this author. e-mail: [email protected]
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Abstract

The Fe64B22.8Nd6.6Y3.9Nb2.7 nanocomposite permanent magnets in the form of rods of 2 mm in diameter and 25 mm in length have been prepared by annealing the amorphous precursors. The phase evolution, microstructure, and magnetic properties of Fe64B22.8Nd6.6Y3.9Nb2.7 nanocomposite permanent magnets have been investigated by x-ray diffractometry, transmission electron microscopy, and magnetometry techniques. The exchange coupling between the magnetically soft and hard magnetic phase is evidenced by the δM curves. The hard magnetic properties of the nanocomposites were found to be sensitive to the annealing process. The microstructure of the annealed nanocomposite consists of magnetically soft α-Fe (15–25 nm) and Fe3B (25–35 nm) grains and hard magnetic Nd2Fe14B (45–55 nm) grains. The optimum hard magnetic properties, such as jHc = 961.6 kA/m (12.0 kOe), Br = 0.65 T (6.5 kG), and BHmax = 65.17 kJ/m3 (8.19 MGOe), were obtained by annealing the alloy at 700 °C for 15 min and are related to the more refined nanostructure leading to strong exchange coupling between the soft and hard magnetic grains. Annealing above 700 °C induces a decoupling effect due to the coarsening of soft and hard magnetic phases.

Keywords

Magnetic propertiesAmorphousNanostructure
Type
Articles
Information
Journal of Materials Research , Volume 27 , Issue 4 , 28 February 2012 , pp. 725 - 729
Copyright
Copyright © Materials Research Society 2011

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