MAGNETIC INTERACTION OF THE COMPOSITE MIXTURES Nd-Fe-B/Sm2Co17

Abstract

Hybrid-bonded isotropic Nd-Fe-B /anisotropic Sm 2 Co 17 magnets with different mass fraction of Sm 2 Co 17 powders had been analyzed with the aid of magnetization and demagnetization curves. It was found that the Henkel plot of magnet with 10 wt.% Sm 2 Co 17 lies above the Wohlfarth line at low magnetic field but goes down slowly and then lies below the Wohlfarth line at high magnetic field. This shows magnetizing interaction at first and demagnetizing interaction at last, and presents an s-shaped behavior that has been seen frequently in nanocomposite exchange-coupled magnets. The demagnetization curve of 10 wt.% Sm 2 Co 17 content hybrid-bonded magnet exhibits a magnetically single phase behavior which has also been seen frequently in nanocomposite exchange-coupled magnets, indicating complex magnetic interaction between these two magnetic particles. As a result, a small increase in remanence and energy product are observed in hybrid-bonded Nd-Fe-B/Sm 2 Co 17 magnets with 10% mass fraction of Sm 2 Co 17.