Composition dependence of the magnetic properties of banded magnets of strontium hexaferrite-polyvinyl chloride

A systematic study of the magnetic properties of strontium ferrite-polyviny l chloride plastoferrites as a function of composition is presented. Plasto ferrites were manufactured by hot compression of a mixture of commercial po wders of strontium ferrite (SrFe12O19) and polyvinyl chloride. In order to explain the dependence of the volumetric density and the saturation magneti zation with composition, an additive model for these properties is consider ed. The intrinsic coercivity shows a decrease with increasing strontium fer rite content, which is interpreted as a magnetizing-like effect due to the increasing interaction between the magnetic particles. The maximum energy p roducts are lower than 1 MGOe and increase with the second power of the str ontium ferrite content. The best maximum energy product and specific satura tion magnetization were obtained for the plastoferrite with a 85 weight per centage of ferrite.