剪断変形型圧電素子を用いたアクティブヘッドスライダ [in Japanese] Active Head Slider with Piezoelectric Actuator Using Shear Mode Deformation [in Japanese]
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The rapid increase in the recording density of hard disk drive (HDD) has required a significant decrease in the flying height of sliders. The active-head slider technology for HDD is one of the most promising means to decrease flying height. This paper describes a piezoelectric flying height control (PFC) slider which has a faster dynamic response compared with conventional active-head sliders. This slider can be also adapted to the conventional slider-fabrication process. PZT layer located near the magnetic head has shear mode deformation by applying electric voltage between the upper and lower electrodes when the flying height of magnetic head needs to be decreased or increased. We fabricated a prototype with single crystal Si substrate for feasibility study. Our evaluation of the prototype revealed that the piezoelectric constant of the shear mode deformation was 0.88 nm/V, and the first resonant frequency was 50 kHz. The shape of the air bearing surface (ABS) was optimized by simulations using a robust design method. We found that the stroke was 8 nm for an applied voltage of 11 V if the flying height was 11nm.
- The Journal of the Institute of Electrical Engineers of Japan
The Journal of the Institute of Electrical Engineers of Japan 128(6), 277-284, 2008-06-01
The Institute of Electrical Engineers of Japan