Abstract
The pitching motions of magnetic heads sliding in contact with three different kinds of rigid disks were measured using an optical reflection system composed of a position sensor and a laser. It was found that a typical texture structure on a conventional aluminum disk motivated a free slider vibration at about 1.8 kHz with the amplitude of the pitching angle of the order of 2 μrad. A rectangular bump of 0.18 μm height induced a stumbling motion with the pitching angle change up to 0.2 mrad, which was similar in behavior to the case of a flying head but the magnitude was twice as much. Stick-slipping on a glass disk caused the head to slideasstanding on the front toe and keeping the pitching angle higher than 0.3 mrad. A simple elastic calculation indicated that over 10 μrad inclination of a slider would result in standing on the toe, and that its toe edge would depress the disk surface by an amount of about 2 nm. It was suggested that the depression by the toe edge would cause damage of the disk surface.
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