In many papers presenting FORC (First Order Reversal Curves) diagrams we can often see regions with negative amplitudes. They are presented, but never interpreted. Such hysterons have an obvious property that their up-switching fields are lower than their down-switching fields - contrary to the classical Preisach hysterons. In consequence they should be rather located in the other half-plane of FORC diagram than ordinary hysterons, and with positive amplitude(??). Such hysterons (alone) could nicely describe the magnetization/hysteresis of superonductors (or diamond). Even more: in general case the contents of full plane (Hup, Hdown), being everywhere non-negative, could be treated as a probability distribution of observed hysterons. What do you think?
P.S. Hysterons with Hup < Hdown should not be carelessly interpreted as "diamagnetic". They can be found in FORC diagram of Stoner-Wohlfarth particle, when exciting field makes an angle with easy magnetization axis roughly in range [70, 90[ degrees. The hysteresis loop is self-intersecting then.
P.S.S. What about the "hysterons" with Hup=Hdown, i.e. those located on a straight line in the Preisach plane?
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