Journal of Electrical and Electronic Materials

"Coercivity"

Inward Diffusion of Tb Ions and the Magnetic Properties of the Nd-Fe-B Magnets: Seong-uk Oh, Dong-whan Kim, Gun-seung Gong, Young-woo Heo, Jeong-joo Kim, Joon-hyung Lee; J Korean Inst Electr Electron Mater Eng 2017;30(1):27-31. Published online January 1, 2017; DOI: https://doi.org/10.4313/JKEM.2017.30.1.27

Abstract
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In this study, the effect of Tb inward diffusion on the magnetic properties of the Nd-Fe-B sintered magnets was studied. After sintering of the magnets, TbF₃ slurries were dip-coated on the surface of the samples, then heat-treatment was followed for TbF₃ diffusion. The element distribution in the magnets and the diffusion profiles of Tb ions were analyzed by an EPMA (electron probe micro-analyzer). Prolonged heat treatment resulted in a deeper diffusion length of Tb ions. Coercivity of the 1^st heat-treated sample showed 21.86 kOe, while that of the 1^st, 2^nd heat-treated and annealed sample revealed 34 kOe.

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Study on the Demagnetization and Classification of NdFeB Magnets According to Different Heat Treatment Temperatures
Byeong Jun Kim, Ik Keun Park, Young Sung Kim
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