Title :
The effect of magnetic field treatment on enhanced exchange coupling of Nd2Fe14B/Fe3B magnet
Author :
Yang, Choong Jin ; Park, Eon Byung
Author_Institution :
Electromagn. Mater. Lab., Res. Inst. of Ind. Sci. & Technol., Pohang, South Korea
fDate :
9/1/1996 12:00:00 AM
Abstract :
An externally applied magnetic field during heat treating the Nd 2Fe14B/Fe3B based spring magnet was found to enhance the exchange coupling between the hard and soft magnetic grains. More than 30% increase in Mr/Ms values for melt-spun Nd4Fe73.5Co3(Hf 1-xGax)B18.5 (x=0. 0.5, 1) alloys was resulted from a uniform distribution of Fe3B, α-Fe as well as Nd2Fe14B, and also from the reduced grain size of those phases by 20%. The externally applied magnetic field induced the uniform distribution of fine grains. The present study also showed that there is an optimum grain size exhibiting a high coercivity (22 nm for the Nd4Fe73.5Co3Hf1-x GaxB18.5 alloys)
Keywords :
boron alloys; cobalt alloys; coercive force; demagnetisation; exchange interactions (electron); ferromagnetic materials; gallium alloys; grain size; hafnium alloys; iron alloys; magnetic hysteresis; magnetic particles; neodymium alloys; permanent magnets; remanence; soft magnetic materials; 22 nm; Nd2Fe14B/Fe3B; Nd4Fe73.5Co3Hf1-xGa xB18.5; Nd4Fe73.5Co3HfGaB18.5 -Fe3B; coercivity; demagnetization factor; enhanced exchange coupling; grain size; hard magnetic grains; hysteresis loops; magnetic field treatment; remanence; soft magnetic grains; spring magnet; Cobalt alloys; Couplings; Gallium alloys; Grain size; Hafnium; Iron alloys; Magnetic fields; Neodymium; Soft magnetic materials; Springs;
Journal_Title :
Magnetics, IEEE Transactions on
