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Coercivity enhancement of Dy-coated Nd-Fe-B flakes by crystallization

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Title: Coercivity enhancement of Dy-coated Nd-Fe-B flakes by crystallization
Authors: Fukunaga, Hirotoshi / Sugimoto, Y. / Nakano, Masaki / Yanai, Takeshi / Ohta, S. / Itakura, M. / Nishida, M.
Issue Date: 1-Apr-2011
Publisher: American Institute of Physics
Citation: Journal of Applied Physics, 109(7), 07A701; 2011
Abstract: The coercivity of isotropic Dy-coated Nd-Fe-B flakes was enhanced by crystallization and simultaneous diffusion of Dy from their surfaces. Amorphous Dy-coated Nd-Fe-B flakes were crystallized by heating them to 923 K 2over a 2 min period followed by rapid cooling. During crystallization, the Dy on the surface diffused into the flakes. This low-temperature rapid annealing produced flakes with fine grains and the Dy diffusion enhanced their coercivity. The coercivity after crystallization increased with increasing Dy layer thickness, although the remanence decreased when the layer thickness exceeded 3 μm. Thick coatings of over 6 μm resulted in the formation of DyFe2, which degraded the magnetic properties of the crystallized flakes. Flakes with a 3-μm-thick coating exhibited excellent magnetic properties after annealing: They had a coercivity of 1880 kA/m and a remanence of 78 emu/g. This coercivity is approximately 500 kA/m higher than that of uncoated flakes, whereas the remanence is comparable to that of uncoated flakes.
URI: http://hdl.handle.net/10069/25449
ISSN: 00218979
DOI: 10.1063/1.3549604
Rights: © 2011 American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics.The following article appeared in [Journal of Applied Physics, 109(7), 07A701; 2011] and may be found at http://dx.doi.org/10.1063/1.3549604.
Type: Journal Article
Text Version: publisher
Appears in Collections:Articles in academic journal

Citable URI : http://hdl.handle.net/10069/25449

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