Quantifying dipolar mean-field interactions from hysteresis and initial curves: A fast Magnetometry route to iSFD Deshearing

We present a fast magnetometry route to quantify dipolar mean-field coupling α and recover the intrinsic switching-field distribution (iSFD) using only a major hysteresis loop plus the initial magnetization curve acquired from an AC-demagnetized state. Within a Stoner–Wohlfarth/Preisach mean-field picture, interaction-induced shearing broadens susceptibilities; α is obtained from area identities at high remanence and, for low-remanence systems, from an offset-free derivative estimator. Validation on Sr-hexaferrite nanoparticles embedded in PVA nanofibers yields α ≈ − 535 , − 740 and − 840 Oe for 1.5%, 2.0% and 2.5% loadings, respectively, and deshearing collapses loops and susceptibilities onto their intrinsic references. The workflow includes two internal consistency checks, post-deshearing antisymmetry of branches and initial-curve/upper-branch overlap for H ≥ 0 , making the estimate auditable. Compared to Δ M /Henkel and FORC, the method requires a single loop plus one initial curve and remains robust in the presence of reversible contributions. • A quantitative mean-field interaction parameter is extracted using only a major hysteresis loop and the initial magnetization curve. • The approach enables direct deshearing of magnetization curves and recovery of the intrinsic switching-field distribution (iSFD). • The method remains valid for both high- and low-remanence nanoparticle ensembles, including randomly oriented systems. • Internal consistency checks ensure the reliability of the interaction parameter without requiring FORC or full IRM–DCD protocols. • Experimental validation is demonstrated on exchange-decoupled SrM nanoparticles embedded in polymer nanofibers.