焼成鉄ナノ多結晶体の磁気特性と高周波電気抵抗の局所的消失

抄録

Sintered Fe nanopaste with Fe nano-polycrystalline has ferromagnetism. Sintered Fe nanopaste with Fe nano-polycrystalline will be applicable to magnetic materials, especially to core inductors. Magnetization curve of the reduced Fe nanoparticles and the sintered Fe nano-polycrystalline were measured. Next, we researched the resistance of sintered Fe nanopaste when a power source with a high frequency was connected. It has been clarified that the resistivity of Fe nano-polycrystalline decreased by cancelling the skin effect due to the negative permittivity of Fe particles. In addition, a singular radical vanishing of the resistivity of the Fe nano-polycrystalline and negative resistance at low current around the high magnetic resonance frequencies were observed. These properties occur only in metal nano-polycrystalline. The measured resistivities were also compared with the calculated ones evaluated by a theoretical analysis. The calculation method includes magnetic field, electric field, and negative permittivity of the Fe particles in the Fe nano-polycrystalline. They have good consistence with the experimental ones.