| 摘要 |
PURPOSE:To form efficiently a magnetic head having a high accuracy by forming a joint groove, and a groove lower half part except a groove upper half part for prescribing a gap depth of a winding groove, in a groove forming process, and thereafter, forming a track width control groove. CONSTITUTION:A pair of wafers 1, 2 are prepared by cutting an ingot of an Mn-An ferrite single crystal, and joint surfaces 10, 20 are formed by performing a super- specular polishing to the respective surfaces. To the joint surface 10 of one wafer 1, a joint groove 60 of many lines and a groove lower half part (a) of a winding groove 50 are opened by using a grinding wheel of a shape corresponding to a groove to be formed, and opened to a groove width (e) which is narrower by a small size (d) than a groove width (h), except a groove upper half part (b). Subsequently, a track width control groove 70 is opened to a prescribed size, and in the end, the groove upper half part (b) of the winding groove 50 is worked. As a result, the winding groove 50 of the prescribed groove width (h) is formed, an initial gap depth (g) of before a finish polishing of a tape opposed contact surface is finished with a high accuracy, and a grooved wafer 1 is obtained. Also, in the other wafer 2, the track width control groove 70 is opened at a comparatively low polishing speed, by which the working accuracy is improved.
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