Optical Measurement of Flying-Heitht Change Due to Thermal Protrusion of Magnetic Head

To achieve an ultra-low flying height in magnetic head sliders for next generation hard disk drives, we are investigating individual in-situ technique to adjust flying height using a built-in thermal actuator to compensate for flying-height deviations and variations. To resolve this lack of agreement, we optically evaluated the slider´s flying height at multiple positions using flying-height tester. We predicted compensation effect by modified air bearing simulator that takes into account of thermal protrusion