| 摘要 |
PURPOSE:To form thin magnetic films which act as a head core in the stage of reproduction and as a gap in the stage of recording by forming the thin magnetic films having a small satd. magnetic flux density and high magnetic permeability on the joint surfaces of magnetic core half bodies. CONSTITUTION:A pair of the magnetic half bodies 1a, 1b consisting of a ferromagnetic material (e.g.; ferrite) are butted to form the gap 3 consisting of a nonmagnetic material (e.g.; SiO2). The thin magnetic films 4a, 4b consisting of the magnetic material (e.g.: Ni-Fe alloy, about 30% Ni) having the small satd. magnetic flux density and large magnetic permeability are formed on the joint surfaces of the half bodies 1a, 1b by a thin film vacuum forming technique. The density of the magnetic flux passing the films 4a, 4b is small and therefore, the films 4a, 4b, act as the magnetic core in the stage of reproduction, according to the above-mentioned constitution. The density of the magnetic flux passing the films 4a, 4b is large and therefore, the films 4a, 4b induce magnetic saturation and act as the gap material in the stage of recording. The satisfactory recording with a recording medium having high coercive force is thereby made possible and the reproduction gap is made smaller. |
