| 摘要 |
PURPOSE:To effectively utilize the high saturation magnetic flux density characteristic by abutting magnetic core halves on each other while shifting the halves from each other so that a ferromagnetic oxide is not confronted with a ferromagnetic thin film on a magnetic gap forming surface. CONSTITUTION:The magnetic core halves I and II are composed of magnetic core parts 11 and 12 each consisting of a ferromagnetic oxide and ferromagnetic metallic thin films 13A and 13B formed on the ferromagnetic thin film forming the surfaces of the core parts 11 and 12 by a vacuum thin film forming technique. The magnetic gap is formed by abutting the magnetic thin films 13A and 13B on each other, the ferromagnetic thin film forming surfaces and a magnetic gap forming surface 10 are inclined to a specified angle on the magnetic recording medium facing surface, and the abutted ferromagnetic metallic thin films 13A and 13B are connected almost in a straight line. Meanwhile, the ferromagnetic metallic thin films 13A and 13B of one magnetic core halves I and II and the ferromagnetic oxide of the other magnetic core halves I and II are not confronted with one another on the magnetic gap forming surface 10. By such a structure, the optical track width and the effective track width in recording or the effective track width in reproduction are almost equalized, and the high saturation magnetic flux density characteristic of the ferromagnetic metallic thin film can be effectively utilized.
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