A specific Ritz model is suggested, in which magnetization curls around the outer part of a sphere, while an inner core is saturated. This model is used to calculate the magnetic field dependence of the magnetization in perfect ferromagnetic spheres, with no anisotropy. For sufficiently small radii, the results indicate an infinite permeability at zero applied field, which brings the average magnetization to an appreciable part of its saturation value. This is then followed by an almost linear dependence of the average magnetization on the applied field, practically up to saturation.

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