A Study on the Exchange-Coupling Effect of Nd₂Fe₁₄B/CoFe Forming Core/Shell Shape

Abstract

We report the core/shell type as the interesting one of the various techniques to prepare exchange-coupled permanent magnet. In this study, the exchange-coupled Nd₂Fe₁₄B/CoFe was prepared by ball mill method and chemical reduction. Nd₁₅Fe₇₇B₈ powder was prepared by ball milling and the as-milled powder was coated with CoFe nanoparticle by chemical reduction. After annealing, Nd₂Fe₁₄B/CoFe forming core/shell shape was identified by using FE-SEM, XRD, TMA, and VSM.

Keywords:

• chemical reduction
• core/shell
• exchange-coupling

Acknowledgments

Chang Woo Kim would like to thank the financial support by the Brain Korea 21 project in 2006.