Abstract
Exchange-coupling effect of Nd2Fe14B/FeCo nanocomposite by colloidal method is reported. The magnetic hard phase Nd15Fe77B8 alloy was prepared by high energy ball mill process and the magnetic soft phase Fe-Co nanoparticles was synthesized by coprecipitation method, and then were annealed in order to crystallize at the different temperature. The hard phase Nd15Fe77B8 nanoparticles and the soft phase Fe-Co nanoparticles were coated with surfactants such as oleic acid. The hard and soft phase nanoparticles coated by surfactants were mixed by self-assembly with shake-milling process, and then annealed at 650°C for 20 min.
Acknowledgments
This work was supported by Korean National Research Laboratory Program. Chang Woo Kim would like to thank the financial support by the Brain Korea 21 project in 2006.