Dual servo control for aperture type near field storage head

개구형 근접장 헤드장치의 간극제어를 위한 이중 서보 제어

This paper presents active control of aperture type near-field storage head. In order to achieve fast and accurate control, dual servo control algorithm is applied. Based on the big difference in time constant, we seperate two actuator and control independently. With the combination of fine and coarse actuator, gap is controlled within 100nm until the disk rotates upto 10 rpm speed. From the experimental results, the feasibility and performance of active gap control is proved.