| 摘要 |
An object of the present invention is to provide a thin-film magnetic head device capable of magnetically writing magnetic signals into a magnetic recording medium having a high coercive force and reading the same therefrom. At least one of upper and lower magnetic layers is composed of a main magnetic layer and a sub magnetic layer. The sub magnetic layer has a saturation magnetic flux density of 1.5T or greater, a magnetic permeability of 1000 or less and an anisotropic magnetic field of 10 Oe or greater. The thickness of the sub magnetic layer should preferably be 0.5 mu m or less. According to the present invention, the sub magnetic layer can obtain a high saturation magnetic flux density and the main magnetic layer can attain a high magnetic permeability. With a thickness of 0.5 mu m or less, the sub magnetic layer can obtain a high saturation magnetic flux density without reducing the magnetic permeability.
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