Influence of annealing temperature on the phase transformation in the Nd2Fe14B/a--Fe nanocomposite mulitilayer films

Chin J Mater Res

2004, Vol. 18

Issue (2): 119-122 DOI:

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Influence of annealing temperature on the phase transformation in the Nd2Fe14B/a--Fe nanocomposite mulitilayer films

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中国科学院金属研究所

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;. Influence of annealing temperature on the phase transformation in the Nd2Fe14B/a--Fe nanocomposite mulitilayer films. Chin J Mater Res, 2004, 18(2): 119-122.

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Abstract Microstructure of Nd2Fe14B/a-Fe-type multilayer films annealed at 600℃ for 5 min and annealed at 625℃ for 1 min with the same thickness of a--Fe layers (2.5 nm) have been investigated by TEM and HRTEM. The result showed that a-Fe nano-grains formed in Fe layers in the as--sputtered film, however, the hard magnetic phase remained amorphous state. When the annealing temperature was higher than 600℃, Nd2Fe14B type phases formed, the a--Fe layers were devoured by the hard magnetic layers, and Nd2Fe17 phases were found in another multilayer film annealed at 625℃. It implied that the annealing temperature played a more important role in the phase transformation than the annealing time. The decrease of magnetic properties maybe resulted from the separating out of Nd2Fe17 phase.

Key words: metallic materials nanocomposite permanent magnets multilayer films microstructure exchange coupling

Received: 21 May 2004

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