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Preparation and Magnetic Properties of the Exchange Coupling NdFeB Nanocomposited Permanent Magnets

[+] Author Affiliations
Zongjun Tian, Yinhui Huang

Nanjing University of Aeronautics and Astronautics, Nanjing, China

Shangdong Li

Fujian Normal University, Fuzhou, China

Youwei Du

Nanjing University, Nanjing, China

Paper No. MNC2007-21156, pp. 1267-1270; 4 pages
doi:10.1115/MNC2007-21156
From:
  • 2007 First International Conference on Integration and Commercialization of Micro and Nanosystems
  • First International Conference on Integration and Commercialization of Micro and Nanosystems, Parts A and B
  • Sanya, Hainan, China, January 10–13, 2007
  • Conference Sponsors: Nanotechnology Institute
  • ISBN: 0-7918-4265-7 | eISBN: 0-7918-3794-7
  • Copyright © 2007 by ASME

abstract

The effect of indium additions on the microstructures and magnetic properties of Nd9 Fe85−x B6 Inx (x = 0–2) nanocomposites prepared by melt spinning was investigated. It was found that a certain amount of indium added to Nd9 Fe85 B6 magnets enhances the hard magnetic properties. The coercivity and remanence ratio of the magnet with 0.5 at.% indium increases from 405kA/m (no indium) to 465kA/m and from 0.7 to 0.86 respectively. Squareness of its hysteresis loop is also improved greatly. The optimum energy product (BH)max increases remarkably from 95kJ/m3 to 145kJ/m3 . The origin for those enhancements is mainly attributed to the magnetically softened grain boundaries and enhanced crystallographical coherency by indium addition. The magnetic annealing is found to be helpful to enhance the coherency and coupling between hard and soft phases.

Copyright © 2007 by ASME

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