| 摘要 |
PROBLEM TO BE SOLVED: To obtain a W-type ferrite plastic magnet, which uses a W-type ferrite powder having high magnetic characteristics and has superior magnetic characteristics not obtained from the conventional M-type ferrite. SOLUTION: This W-type ferrite plastic magnet is made by kneading and molding a W-type ferrite powder, having a compsn. AO.n(BO).mFe2O3 and a mean powder grain size of 0.3-3μm with a thermoplastic resin 6-25% of a molding mass, where A is one or more of Ba, Sr, Ca and Pb, B is one or more of Co, Ni, Mn, Mg, Cr, Cu and Zn, 7.4<=m<=8.8, 1.2<=n<=2.5, and 8.8<=m+n<=10.8.
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