THE REMANENT STATE OF FINE PARTICLES

Computations of the structure and energy of the magnetization configur ations in very small particles have reached the limit of validity of t he basic assumptions used in this theory, and the analytic models whic h have been published so far are not more reliable, for anything but e llipsoids. A review of all the theoretical studies leads to the conclu sion that a good and clear definition of what fine particles really ar e should be introduced before trying to evaluate their magnetization.