Journal
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
Volume 439, Issue -, Pages 91-94Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jmmm.2017.04.081
Keywords
Nd-Fe-B nanoparticles; Washing process; Reduction-diffusion; Magnetic property; Magnetic interaction
Funding
- R&D Convergence Program of MSIP (Ministry of Science, ICT and Future Planning)
- ISTK (Korea Research Council for the Industrial Science and Technology) of Republic of Korea [B551179-11-01-00]
- National Research Council of Science & Technology (NST), Republic of Korea [B551179-11-01-00] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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Nd-Fe-B nanoparticles with a particle size below 50 nm and excellent magnetic properties were obtained via a novel route which makes use of both spray drying and reduction-diffusion processes. Uniform Nd-Fe-B particles were formed by the optimization of Ca amount as a reducing agent and additional washing by milling in ethanol media. Especially, we implemented a two-step washing process which contributed to the excellent magnetic properties with high remanence and coercivity. After the removal of CaO by novel washing process, the maximum energy product (BH)(max) of the particles showed 22.1 MGOe. This value is superior to those reported in reduction-diffusion process. We used Henkel plot to assume the mechanism of magnetic interactions of the Nd-Fe-B nanoparticles. (C) 2017 Elsevier B.V. All rights reserved.
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