Magnetic properties of hybrid-soft magnetic composites

Soft magnetic composites containing an organic binder and mixtures of two different soft magnetic particles – iron and nano-crystalline Fe73.5Si15.5B7Cu1Nb3 – in varying mixing ratios have been prepared at a total filler fraction x mag = 0.5 and examined regarding the magnetic properties. Results show that the coercivity is decreased by replacing the magnetically harder material with the magnetically softer material in the composite until a certain threshold value of the mixing ratio is reached. Above this threshold the coercivity stays nearly constant. Total losses P / f , saturation polarization J s and inner demagnetization factor N i follow a linear mixing rule. The composite’s permeability μ is a result of filler fraction, mixing ratio, coercivity, polarization and inner demagnetization factor and due to that complex dependence hardly predictable.