Patent ID: 7289010
Filing Date: 2007-10-30
Classification: C01G,C01P,C04B,C22C,H01F,Y10T

Abstract:
1. A Mn—Zn based ferrite member comprising: a magnetic body formed of a Mn—Zn based ferrite sintered body; and a surface layer portion formed on the surface area of said magnetic body and having the properties that ρ5 defined below satisfies the relation that ρ5≧10 R0 (Ω) represents a resistance value between an electrode formed on the whole area of a first surface of a measurement sample A and an electrode formed on the whole area of a second surface thereof, the measurement sample A being taken from said Mn—Zn based ferrite member, having said first surface and said second surface that are parallel and opposed to each other, and forming a columnar body of a constant sectional area S (mm R1 (Ω) represents a resistance value between an electrode formed on the whole area of a polished surface formed by polishing away a 10 μm layer from said first surface of said measurement sample A and said electrode formed on the whole area of said second surface; R2 (Ω) represents a resistance value between an electrode formed on the whole area of a polished surface formed by polishing away a 40 μm layer from said first surface of said measurement sample A and said electrode formed on the whole area of said second surface; and R3 (Ω) represents a resistance value between an electrode formed on the whole area of a polished surface formed by polishing away a 60 μm layer from said first surface of said measurement sample A and said electrode formed on the whole area of said second surface.