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No.2(pp.27-68)

Home > Issues > Volume 9 (2004) > No.2(pp.27-68)

Exchange Coupling in Massively Produced Nd₂Fe₁₄B+Fe₃B Nanocomposite Powders

Journal of Magnetics, Volume 9, Number 2, 30 Jun 2004, Pages 27-33

Choong Jin Yang*

(Research Institute of Industrial Science ＆ Technology (RIST), Nanotechnology Research Lab), Eon Byung Park(Research Institute of Industrial Science ＆ Technology (RIST), Nanotechnology Research Lab), Jong Soo Han(Research Institute of Industrial Science ＆ Technology (RIST), Nanotechnology Research Lab, Dept. of Physics, Youngnam National Universit), Eung Chan Kim(Dept. of Physics, Youngnam National University)

Abstract

Magnetic properties of Nd₄Fe_77.5B_18.5 compound in term of exchange coupling between Nd₂Fe₁₄B and Fe₃B magnetic nano crystals in melt spun powders were characterized by varying the quenching speed in mass production line. The exchange coupled phenomenon was characterized as functions of nano crystal size and volume fraction of each magnetic phase which was possible by employing Henkel plot (δM) and refined Mossbauer spectroscopy. The optimized magnetic properties obtained from the present volume production line were: Br = 11.79 kG , _iH_c= 3.082 KOe, and (BH)_max= 12.28 MGOe The volume fraction of each magnetic phase for those conditions giving the grain size of 10 nm were α-Fe;4.2%, Fe₃B; 60.1% and Nd₂Fe₁₄B;35.7%. The superior magnetic properties in the based nanocomposites were confirmed to be dependant on the volume fraction of Fe₃B.

Keywords: nanocomposite permanent magnet; exchange coupling; nanocrystal size; volume fraction

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