Factors Affecting Magnetic Properties of Fe-Si-Al and Ni-Fe-Mo Alloys

In this paper, morphological, structural and magnetic properties of FeSiAl and NiFeMo flaky-shaped particles prepared by high-energy ball-milling were investigated. The as-milled powders were annealed at different temperatures with subsequent silica coating deposited on the surface of metal particles through hydrolysis and condensation of tetraethyl orthosilicate. The effect of the annealing treatment on structural parameters of FeSiAl and NiFeMo was evaluated by X-Ray diffraction peak broadening analysis. Static magnetic properties, i.e. coercivity and saturation magnetization measured by vibrating sample magnetometer (VSM) were analyzed with the respect to the grain size and internal stresses of FeSiAl and NiFeMo. Relative complex permeability spectra of composite membranes prepared by tape casting method and filled with as-annealed FeSiAl and NiFeMo flaky-shaped particles have been measured in the frequency range from 1 MHz to 3 GHz.