| 摘要 |
PURPOSE:To satisfy both an output characteristic and contact start stop attraction characteristic by providing a piece of a groove which intersect at a specific angle with a circle concentrical with the center of a disk and is limited in width and depth onto an anodically oxidized film to the specific width in the region where the slider of a magnetic head moves. CONSTITUTION:At least a piece of the groove which intersects at 0-45 deg. with the circle concentrical with the center of the disk and has 0.1-2mum width and 0.005-0.3mum depth is provided onto the anodically oxidizied film at 10mum in the region where the slider of the magnetic head moves. There is no significant difference in the attraction characteristic as compared to the disk having no groove if the depth of the groove is <=0.005mum. The magnetic film provided to the bottom of the groove no longer senses the magnetic field of the head and such is not preferable for the overwrite characteristic of the output and noise if the depth is >=0.3mum. The angle of the groove intersecting with the circumferential direction of the disk is preferably 45 deg., ore particularly preferably 2-5 deg. in order to form the thin film magnetic disk for the subtantially higher density recording.
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