The effect of volume concentration on the properties of easy-plane FeSiAl composites working in high frequency band

Abstract

In this study, to investigate the effect of volume concentration on core loss in the high frequency band (~MHz), easy-plane soft magnetic composites (SMCs) of FeSiAl particles with different volume concentrations were prepared successfully by magnetic field orientation. The permeability of the SMCs was decomposed into the domain wall component and the spin component and was well simulated. The core loss was successfully decomposed into hysteresis loss, eddy current loss and excess loss. It was shown that the permeability of the SMCs was continuously improved as the volume concentration of FeSiAl in the SMCs increased, while the core loss decreased first and then increased due to the different performances of the hysteresis loss, eddy current loss, and excess loss. Samples with a permeability of 310 exhibited the lowest core loss of 399 kW/m3 (f=3 MHz, 10 mT). The results indicated that there is an optimal volume concentration at which SMCs have a relatively high permeability and minimum core loss.

Wide induction range analysis of DC magnetic properties and magnetization processes of Fe-based soft magnetic composites

“…Therefore, to better understand the behaviour of this increasingly popular class of materials for their prospective improvement, the mentioned factors, as well as the magnetic interactions between adjacent particles and the movability of domain walls, are of great significance to be studied in detail and considered in various models when applied to SMCs. For example, the Jiles-Atherton model in [24][25][26], the Steinmetz law in [2,22,27], the first-order reversal curves analysis in [6], the models for magnetization curves in [28][29][30], for energy losses in [2,3,5,7,25,[31][32][33][34][35], for different kinds of magnetic permeability in [2,9,14,15,[36][37][38][39][40][41][42][43], for inner demagnetizing fields in [2,4,38,[44][45][46][47][48] or magnetostriction in [49], were adapted to fit for SMCs. Since the application potential of SMCs covers a wide range of frequencies and magnetic inductions, researches are carried out in different ranges of these parameters.…”