Microstructure of Anisotropic Nd-Fe-B Film Magnets Prepared by Pulsed Laser Deposition

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Microstructure of the anisotropic Nd-Fe-B thick-film magnets has been investigated by transmission electron microscopy. Specimens of the thick-film magnets were prepared by the high-speed pulsed laser deposition method with a substrate heating system. It was revealed that the film deposited on a Ta substrate has a three-layer structure of Nd2Fe14B: The lower layer is composed of isotropic grains about 50-300 nm in diameter, the middle one has a columnar structure of 1 3m in height, and the upper one is again composed of small isotropic grains about several ten nm in diameter. The three-layer-structure is explained to result from a partial recrystallization of micro-crystalline Nd2Fe14B that are formed at the moment of deposition. In the middle layer, the c-axis of columnar grains is fairly aligned in the direction perpendicular to the substrate surface. The preferred orientation of c-axis produces the magnetic anisotropy of the thick-films.

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Periodical:

Materials Science Forum (Volumes 561-565)

Main Theme:

Edited by:

Young Won Chang, Nack J. Kim and Chong Soo Lee

Pages:

1131-1134

Citation:

M. Ishimaru et al., "Microstructure of Anisotropic Nd-Fe-B Film Magnets Prepared by Pulsed Laser Deposition", Materials Science Forum, Vols. 561-565, pp. 1131-1134, 2007

Online since:

October 2007

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$38.00

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