Magnetostatic interaction energy between ellipsoidal nanoparticles

Summary form only given. Due to the long-range nature of the magnetostatic interactions, the investigations on magnetic properties of systems composed of nanometric-scale particles require a precise knowledge of the local magnetostatic fields. Until now, solutions for arrays of cubes, spheres, prisms and cylinders have been developed. In this work, we have studied the magnetostatic interactions when the nanometric particles have ellipsoidal shape, which is important in order to study the magnetic processes in high-density magnetic recording media composed of platelets or acicular particles. In general, the magnetic interactions of these systems have been evaluated assuming that the particles act as point magnetic moments. We also show the differences between the real magnetostatic energy and its approximation (particles considered as point magnetic moments). We have evaluated the magnetostatic interaction energy between ellipsoids starting from the magnetostatic field created by uniformly magnetized ellipsoids in external points. The authors show the magnetostatic energy between two uniformly magnetized prolate ellipsoids (semiaxes a>b=c) with their magnetizations parallel, being r the distance between the centers.