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Magnetic hysteresis minor loops were measured with step by step increase of the magnetic field amplitude, H a , in plastically deformed Fe single crystal. In order to analyse minor loops in connection with the lattice defects, we defined some magnetic parameters, such as the pseudo-coercive force, H * c , and the differential susceptibility under the pseudo-coercive force χ * H . H * c , for instance, is the magnetic field where the magnetization becomes zero in minor loops. In this work, we found the relationship 2H * c = H a to hold over a fairly wide H a range. These parameters are important for representing Bloch wall displacement and the potential energy. The parameters are remarkably sensitive to lattice defects in the field range below the coercive force H c . The relation of 1/χ * H and H * c shows better sensitivity-90 times higher than that for H cfor revealing information on dislocations. In the minor loop measurement, for getting full information on dislocations it is sufficient to have H a = 400 A m −1 .

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