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

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 20 vol.% (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 20–30 GHz, which is caused by a large demagnetizing field due to the narrow line width of coplanar line.

► Amorphous Fe–B–P submicron chains with good magnetic softness were fabricated by chemical reduction.
► The composite (Fe–B–P chains – 20 vol.% (Ni0.6Zn0.4)Fe2O4 nanoparticles) exhibits the highest intrinsic permeability(142).
► The resonance frequency of the composite on coplanar line reaches up to about 20 GHz and the pow loss is about 70%.
► The calculation of the shape anisotropy provides a more delicate design of particle materials for further improvement.