Method of manufacturing composite ferrite

Methods of manufacturing a composite ferrite of two or more of metal oxides prepared from a chloride solution containing ions of these metals, one of the metals being zinc. The methods comprise (a) ejecting a high temperature gas to the solution or atomizing the solution and (b) supplying the atomized gas to a combustion gas containing oxygen, to evaporate moisture from mist particles of the solution in a short period of time so that the zinc chloride in the solution is not substantially evaporated and to induce a heat decomposition or chemical reaction for the remaining metal salt particles, thereby forming a composite ferrite.