DUST CORE AND INDUCTOR ELEMENT

To provide a dust core having excellent DC superposition characteristics and small eddy current loss in a high frequency band of about several MHz, and an inductor element using the dust core.SOLUTION: The dust core containing a large particle and a small particle, each composed of insulated soft magnetic material powder is provided in which the saturation magnetic flux density of the large particle and the small particle are 1.4 T or more, and in the soft magnetic material powder observed in the cross section of the dust core, when a particle group having a particle diameter of 3 μm to 15 μm is defined as the large particle and a particle group having a particle diameter of 300 nm to 900 nm is defined the small particle, the ratio of the area occupied by large particles to the area occupied by small particles in the cross section is 9:1 to 5:5.SELECTED DRAWING: None 【課題】 数ＭＨｚ程度の高周波帯域において、直流重畳特性に優れ、かつ渦電流損失の小さい圧粉磁芯、およびそれを用いたインダクタ素子を提供すること。【解決手段】 絶縁された軟磁性材料粉の大粒子および小粒子を含有する圧粉磁芯であって、大粒子および小粒子の飽和磁束密度が１．４Ｔ以上であって、圧粉磁芯の断面で観察される軟磁性材料粉において、粒径が３μｍ以上１５μｍ以下にある粒子群を大粒子とし、粒径が３００ｎｍ以上９００ｎｍ以下にある粒子群を小粒子とするとき、その断面における大粒子が占める面積と小粒子が占める面積との比が９：１〜５：５である圧粉磁芯。【選択図】なし