The interpretation of interaction through Henkel plots and Δm plots has become popular in recent years; however, the demagnetized state is often not specified. In this paper, the demagnetized state dependence of Henkel plots is calculated using the classical Preisach model, the moving model, and the complete-moving-hysteresis model. In the calculation of the virgin remanence curve, ac, dc+, and dc− demagnetized states were used. The resulting collection of Henkel plots contains examples of ‘‘up’’ and ‘‘down’’ deviations from the Wohlfarth line by changing the demagnetized state only.

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Abstruct-The analysis of an artifEial medium has led to a new type of Preisach model where the variance of the interaction field is a function of the magnetization. The "ideal" particles of this medium have no reversible magnetization and only interact magnetostatically with their neighbors. In this model, the line separating the positively and the negatively magnetized regions of the Preisach plane is not a staircase.