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This article presents both finite element and simplified methods to calculate the diffusion of the electromagnetic field in a conducting saturable ferromagnetic disk under transient excitation. Knowledge of only the tangent component of the magnetic field on the disk surface is sufficient to deduce approximately the two characteristic penetration depths of the diffusion as well as the induced current and fields. The two methods are tested on a system consisting of a solenoid through which a 400‐μs current pulse is applied, and a nearby conducting saturable ferromagnetic disk. Interesting results, including fields and forces, are discussed and compared with measurements.