MATERIALS TRANSACTIONS
Online ISSN : 1347-5320
Print ISSN : 1345-9678
ISSN-L : 1345-9678
Microstructure Analysis of High Coercivity PLD-Made Nd-Fe-B Thick-Film Improved by Tb-Coating-Diffusion Treatment
Masahiro IshimaruMasaru ItakuraMinoru NishidaMasaki NakanoHirotoshi Fukunaga
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2010 Volume 51 Issue 10 Pages 1939-1943

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Abstract

Microstructure of high coercive pulsed laser deposition (PLD) made Nd-Fe-B thick-film magnet improved by “Tb-coating-diffusion” treatment has been investigated with an analytical transmission electron microscope (ATEM). It was found that the PLD-made film consists mainly of fine Nd2Fe14B grains about 200 nm in diameter and a large amount of Nd intergranular phases. Energy dispersive X-ray spectroscopy (EDS) analysis showed that each Nd2Fe14B grain is covered with a thin (Nd,Tb)2Fe14B layer about 20–30 nm in thickness and thin Nd-Tb grain-boundary-layer about 5–10 nm in width. The present results indicate that such a two-layered-wrapping structure enhances significantly the coercivity of the PLD-made thick-film magnet.

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© 2010 The Japan Institute of Metals and Materials
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