Characteristics of soft magnetic thin films for magnetic head core application

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Abstract

Recent developments of soft magnetic thin films are reviewed from the viewpoint of magnetic head core applications. Many kinds of alloy films with high saturation flux density over 1.0 T have been investigated in the last decade together with conventional materials such as Fe-Al-Si (Sendust) films and Co-based amorphous alloy films. Almost all reported materials with high saturation flux density are Fe-based alloy, Fe-based micro-crystalline alloy and multilayered alloy films. This paper briefly describes the advantage of soft magnetic thin films with high saturation flux density in high frequency operation to avoid the natural ferromagnetic resonance. The advantage of isotropic Fe-based alloy film is also described for a practical MIG head application.

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