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First Order Reversal Curves (FORCs) have been used for a number of years forthe extraction of information from magnetization measurements. The results aremost unambiguous for irreversible processes -- for a collection of Preisachhysterons, one gets a "FORC distribution" $\rho(H_{down},H_{up})$, the numberof hysterons with given downward \& upward reversal fields. There have beenmany proposals for dealing with reversible behavior, usually involvinginserting it somehow into the irreversible FORC distribution. Here we will tryto do the opposite, to separate them into another function which we will callthe (reversible) "saturation field distribution", which is identically zero fora completely irreversible system of hysterons, while the irreversible FORCdistribution is identically zero for a reversible system. Thus in a system withboth purely reversible and purely irreversible components, such assingle-domain Stoner-Wohlfarth particles with hard or easy axis along thefield, this approach cleanly separates them. For more complicated systems, aswith conventional FORC distributions, it at least provides a "signature" makingit possible to identify microscopic models that might give a particular pair ofirreversible and reversible distributions.

FORC+: A method for separating reversible from irreversible behavior using first order reversal curves