磁気ヘッドスライダのディスク面摺動時におけるピッチング運動挙動

抄録

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.