| 简介 |
PROBLEM TO BE SOLVED : To provide a magnetic core with high specific resistance and stable frequency characteristics, and a coil component using it.
SOLUTION : The magnetic core has gaps on at least one or more parts of a magnetic path, a bond magnet composed of Sm2Co17 rear earth magnet powder and resin with ≥1.94 MA/m intrinsic coercive force and ≥300°C Tc is inserted to the gaps, and a powder particle surface in the bond magnet is coated with a ferrite film which is an oxide magnetic body with a thickness in a range of ≥0.1 μm to ≤20 μm. For the bond magnet, a resin amount is ≥20% by a volume ratio to the rear earth magnet powder, and by ferrite film coating to the Sm2Co17 rear earth magnet powder and resin impregnation, the specific resistance is in a range of ≥1×101 Ωcm to ≤1×105 Ωcm.
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