The relation of induced uniaxial anisotropy and coercive force

Anisotropy induced with magnetic annealing was investigated in different base composition /FeNi50, FeNi58, FeNi75, FeNi43Co23/ alloys in function of oxygen and carbon content. The temperature of magnetic annealing was 430°C, time was 24h, the direction of applied field at some of samples were perpendicular at some were parallel compared to the direction of the measuring field. From the magnetizing energy and the H-dependence of approach to saturation were the anisotropy constants /G and F/ determined. From the Kersten model relating to the fluctuation of the domain wall energy the α structural factor was determined. Special correlation was found in G/F=f/α/, that is between the symmetry of microstructure of induced anisotropy /G/F/ and the fluctuations of inhomogenities determining the H c . This correlation is interpreted as due to the inhomogenous dispersion of impurities which are the major sources of induced anisotropy.