5718 磁気ヘッドの熱突出による浮上姿勢変化の光学的測定(S84-2 情報機器コンピュータメカニクス(2),S84 情報機器コンピュータメカニクス)

概要

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To achieve an ultra-low flying height in magnetic head sliders for next generation hard disk drives, we are developing an individual and in-situ technique to adjust flying height using a built-in thermal actuator to compensate for flying-height deviations and variations. We have evaluated changes in the flying-height of a prototype slider by observing the amplitude of read back signals. However, the observed flying-height change is much smaller than the predicted value by simulation. To resolve this issue, we optically evaluated the slider's flying height at multiple positions, which revealed a "compensation effect" due to increasing air pressure. That is, the pressure on the air-bearing surface increases as the head protrudes downwards by thermal expansion, which lifts the slider upwards. The evaluation also showed a reduction in the pitch angle due to increasing air pressure.
社団法人日本機械学会の論文
2006-09-15