Magnetostatically-Coupled Anisotropic Composite Magnets with Enhanced Remanence
Final rept. 6 Jun 2006-5 Jun 2007
DELAWARE UNIV NEWARK
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The computer simulation confirmed a magnetostatic coupling between R-Fe-B matrix and thick Fe layers in hot-deformed composite magnets. However, enhancement in the remanence and maximum energy product of the hard-soft composites requires at least a partial inter-phase exchange coupling. The combination of a complete magnetostatic coupling and a partial exchange coupling may facilitate the development of anisotropic composite magnets with superior performance. The experimental studies found that 1 magneto-statically coupled soft magnetic phase increases the temperature dependence of the hard magnetic properties 2 re-distribution of elements during thermomechanical treatment is a significant factor affecting the properties of anisotropic composite magnets 3 though the refinement of the precursor powders enables certain control over the morphology and thickness of the soft inclusions, the expected advantages are overcome by the increased oxidation of the R-rich phase andor increased inter-phase diffusion.
- Electricity and Magnetism