SOFT MAGNETIC METAL POWDER-COMPACT MAGNETIC CORE, AND REACTOR ARRANGED BY USE THEREOF

PROBLEM TO BE SOLVED: To provide a soft magnetic metal powder-compact magnetic core superior in DC superposing characteristic.SOLUTION: A soft magnetic metal powder-compact magnetic core comprises: soft magnetic metal powder; and a non-magnetic material. According to observation in a view field including n or more particles of the soft magnetic metal powder (n is a natural number equal to or larger than 50) on a polished smooth section of the soft magnetic metal powder-compact magnetic core, the soft magnetic metal powder is coated with the non-magnetic material, and the circularity of particle sections is 0.75-1.00 as to 80% or more of the soft magnetic metal powder. In addition, the number of opposing portions P of which the length L of an uninterrupted portion of 400 nm or less in inter-particle distance of the soft magnetic metal powder is 10 μm or more is n/2 or more. Supposing that the minimum distance of inter-particle distances of the opposing portions P is a closest distance X, opposing portions P of which the closest distance X is 50 nm or more account for 68% or more of all the opposing portions P.SELECTED DRAWING: Figure 1 【課題】軟磁性金属圧粉磁心において、直流重畳特性に優れるような軟磁性金属圧粉磁心を得ることを課題とする。【解決手段】軟磁性金属粉末と非磁性体を含む軟磁性金属圧粉磁心であり、前記軟磁性金属圧粉磁心の研磨された平滑な断面において、前記軟磁性金属粉末の粒子をｎ個以上（ｎは５０以上の自然数とする）含む視野を観察した場合に、前記軟磁性金属粉末は前記非磁性体により被覆されており、前記軟磁性金属粉末の８０％以上の粒子断面の円形度が０．７５以上１．００以下であり、前記軟磁性金属粉末の粒子間距離が４００ｎｍ以下である連続した部分の長さＬが１０μｍ以上である対向部分Ｐがｎ／２個以上存在し、各々の前記Ｐの粒子間距離のうち、最短距離を最近接距離Ｘとするとき、前記Ｐに対し前記Ｘが５０ｎｍ以上である前記Ｐが６８％以上であることを特徴とする軟磁性金属圧粉磁心。【選択図】図１