FIELD-INDUCED MAGNETIZATION STRUCTURE IN SMALL ISOTROPIC SPHERES

Computations of cylindrically-symmetric magnetization distributions ar e reported for a perfect and isotropic ferromagnetic sphere. The total energy is minimized numerically for various applied fields, with no c onstraint other than imposing that symmetry. It is found that the curl ing configuration at zero field is maintained throughout the whole mag netization process, with only a tilt towards the field direction, whic h increases with increasing field. There is no hysteresis in such an i deally-soft sphere, and the theoretical initial susceptibility is infi nite.