High permeability and electromagnetic noise suppression characteristics of Fe–B–P sub-micron particle chains and their composites with NiZn–ferrite nanoparticles

Abstract

Fe–B–P submicron particle chains and (Ni0.6Zn0.4)Fe2O4 nanoparticles were synthesized by chemical methods. (Ni0.6Zn0.4)Fe2O4 nanoparticles were used to fill in the space among Fe–B–P chains under a magnetic field. The synthetic composite of Fe–B–P chains filled with 20vol.% (Ni0.6Zn0.4)Fe2O4 nanoparticles exhibits the highest intrinsic permeability(142). It is due to the enhanced performance of Fe–B–P particle chains and the effect of (Ni0.6Zn0.4)Fe2O4 nanoparticles, which both decrease the demagnetization field. The composite film also shows a better power loss feature on coplanar transmission line than pure Fe–B–P chains, and the resonance frequencies of the composite films on coplanar line shift to about 20–30GHz, which is caused by a large demagnetizing field due to the narrow line width of coplanar line.