Magnetostatic interactions among fine particles modified with ionic substitutions

The fine particles used in magnetic recording are frequently subjected to crystal lattice modifications with substituting ions in order to make them suitable for application in advanced recording technology. The magnetostatic interactions between the magnetic particles for undoped and doped materials are studied. The experimental investigation of the interactions is performed with the remanence curves analysis. Both in particles, where the doping increases the coercive field, and in particles doped in order to decrease H/sub c/, the doping seems to weaken the interparticle interactions. The result is related to the evolution of the magnetization reversal mechanism in particles whose crystal and magnetic order is modified by ionic substitutions.<>