Examination of the relationship between the parameters of Barkhausen effect model and microstructure of magnetic materials

Abstract

A relationship between the parameters of a hysteretic-stochastic process model of the Barkhausen effect (BE) and the microstructural features of a series of ferritic/pearlitic steel samples has been identified. The root-mean-square values and pulse height distributions of the experimental and modeled BE signals showed similar dependence on the pearlite content. The correlation length parameter ξ of the model, which represents the range of interaction of domain walls with pinning sites, was found to obey ${\mathrm{\xi =AV}}_f{D}_f{\mathrm{+BV}}_p{D}_p$ where $V_f{\mathrm{(V}}_p)$ and $D_f{\mathrm{(D}}_p)$ are the volume fraction and grain size of ferrite (pearlite).