Thanks to Alexandru Stancu and the Iasi group The FORC framework 2

One of the key factors limiting the performance of magnets is that the coercivity and other parameters have a distribution with a finite width, and the reversal starts at the weakest link. We must first determine the distribution of coercivities to learn how to reduce the width of this distribution The FORC technique characterizes a system via the distribution the local coercivities Hc and in addition the local interaction fields Hb FORC captures these as a joint distribution ρ(Hc,Hb) instead of a product of two distributions, thus capturing underlying correlations Perfect Nd2Fe14B grain µ0Hext 4.97 T *saddle point 50 nm T = 300 K- Hysteretic behavior modeled as a collection of hysterons (Preisach 1935)- Hysterons are two state systems with an interaction field Hb and a coercivity Hc, with distribution ρ(Hc,Hb)