A ferrite magnetic material comprising a main phase of W-type is provided which has magnetic properties improved through the optimization of additives. The ferrite magnetic material comprises a main constituent having a compound represented by composition formula AFe.sup.2+.sub.aFe.sup.3+.sub.bO.sub.27 (wherein A comprises at least one element selected from Sr, Ba and Pb; 1.5.ltoreq.a.ltoreq.2.1; and 12.9.ltoreq.b.ltoreq.16.3), a first additive containing a Ca constituent (0.3 to 3.0 wt % in terms of CaCO.sub.3) and/or a Si constituent (0.2 to 1.4 wt % in terms of SiO.sub.2), and a second additive containing at least one of an Al constituent (0.01 to 1.5 wt % in terms of Al.sub.2O.sub.3), a W constituent (0.01 to 0.6 wt % in terms of WO.sub.3), a Ce constituent (0.001 to 0.6 wt % in terms of CeO.sub.2), a Mo constituent (0.001 to 0.16 wt % in terms of MoO.sub.3), and a Ga constituent (0.001 to 15 wt % in terms of Ga.sub.2O.sub.3).

 
Web www.patentalert.com

< Optical writing device and method of manufacturing the same

> Liquid crystal display apparatus

~ 00495