Abstract

Practically, there is no such term as absolute “parameters of a magnetic material” because magnetic performance is strongly shape dependent (due to the demagnetizing field that causes nonuniformity of magnetization and the change of parameters during the preparation of the sample*). Therefore, when parameters are given, it is recommended to indicate what kind of the sample was used for the investigations (Epstein frame, ring core, sheet, strip, etc.). In such a case, we usually test the average parameters of the whole sample, which is often advantageous because this way we take into account possible heterogeneity of the material. ^†