METHOD FOR PRODUCING FERRITE MAGNETIC MATERIAL

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PROBLEM TO BE SOLVED : To provide a production method which can improve magnetic characteristics of a hexagonal M type ferrite containing La and Co (hereinafter referred to as a La-Co-containing M type ferrite) with no increase of the production cost thereof. SOLUTION : The method for producing a ferrite magnetic material which comprises a hexagonal M type ferrite containing Fe, an element A (wherein A is at least one element selected from Sr, Ba and Pb), an element R (wherein R is at least one selected from rare earth elements and Bi and necessarily contains La) and an element M (wherein M is at least one selected from among Co, Mn, Mg, Ni, Cu and Zn and necessarily contains Co), as main elements, and at least an Si component as a sub-component, comprises a step (a) of heating and holding a raw material composition containing the whole or a part of a raw material powder of the hexagonal M type ferrite and 40% or more of the total amount of the Si component at a prescribed temperature, to prepare a calcined product, and a step (b) for pulverizing the calcined product prepared in the step (a). COPYRIGHT : (C)2006, JPO&NCIPI