To the method of study of magnetic transformations in amorphous and mictomagnetic materials

It is shown how the differential magnetic susceptibility ($H/σ$)($σ^2$), which is an important parameter for study of the nature of magnetic transfor -mations in amorphous and mictomagnetic materials, can be calculated by using the $|{∂σ }/{∂ H}|$_{H}={const}}$ relation. By way of example, calculated temperature curves of |δσ/σH|$(T)_{H=const}$ are presented for dilute ferrites with spinel structure: Li$_{0,2}$Zn$_{0,6}$Fe$_{2,2}$O$_{4}$ и Mg$_{1,5}$FeTi$_{0,5}$O$_{4}$.