COMPOSITE MAGNETIC MATERIAL

摘要

PROBLEM TO BE SOLVED: To make a composite magnetic material have a low loss even in a high frequency, a high magnetic permeability and excellent magnetic characteristics in a high-performance metal dust core, which is used for a choke coil or the like. SOLUTION: A composite magnetic material consists of soft magnetic alloy powder and an insulative binding agent and is subjected to heat treatment. The frequency ratio B/A of the granularity distribution of the soft magnetic alloy powder used for the composite magnetic material is set in the ratio of not less than 0.5 when the grain diameter of the powder is D. The greatest frequency of the grain diameter is A% and the frequency of the grain diameter D/2 is B%. It is preferable that the magnetic material is constituted of the soft magnetic material alloy powder of the mean grain diameter of 1μm to 50μm.