Abstract
By analytical electron microscopy and Lorentz microscopy, microstructures and magnetic domain structures of Nd-Fe-B nanocomposite magnets prepared by the melt-spun technique which consists of a mixture of hard and soft magnetic phases were investigated. By energy dispersive X-ray spectroscopy elemental mapping for the neodymium element, hard (Nd 2 Fe 14 B) magnetic grains were distinguished from soft (Fe 3 B or α-Fe) magnetic grains. The Fe 3 B grains could be further distinguished from the α-Fe grains by investigating the boron K-edge in electron energy-loss spectroscopy, despite the strong background in the spectra. From bright-field electron microscopy coupled with energy dispersive X-ray spectroscopy elemental mapping, the grain size distribution of constituent phases in a Nd 4.5 Fe 77 B 18.5 magnet annealed at 973 K was evaluated. An average grain size of Fe 3 B and Nd 2 Fe 14 B grains was evaluated to be about 32 nm and 35 nm, respectively. Through Lorentz microscopy study on the Nd 4.5 Fe 77 B 18.5 magnet annealed at 973 K. the size of the magnetic domain formed through the exchange interaction was found to be 100-150 nm being much larger than the grain sizes of Fe 3 B and Nd 2 Fe 14 B phases.
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