Experimental determination of the shift of the Preisach distribution with magnetization

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Abstract
The remanent magnetization Mr(H−) of the particulate recording media is measured as a function of the applied dc field, −H−, starting from selected states of initial remanence, Mri. The curves of [Mr(H−)−Mri] for Mri≠0 are shifted with respect to the Mri=0 curve along the H− axis by an amount ΔHp− . In general, ΔHp− is an increasing function of Mri and the particle demagnetizing factor. We take the measured ΔHp− to be related to the average value of the interaction field for the sample. The existence of a nonzero ΔHp− supports the idea that systems of ferromagnetic particles can be modeled using a ‘‘moving Preisach distribution.’’