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Thin-film piezoelectric DSA for HDD

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2 Author(s)
Kuwajima, H. ; HD Dev. Center, Matsushita Electr. Ind. Co. Ltd., Osaka, Japan ; Matsuoka, K.

A new dual-stage actuator (DSA) for positioning a magnetic head for high-density hard disk drives was proposed and developed. This DSA device is characterized by applying sputter-deposited thin-film lead-zirconate-titanate material (PZT), instead of the previously proposed bulk type actuator. The device performance was found to be outstanding with peak-to-peak head displacement of 1.2 μm at an applied voltage of ±5 V, and suspension resonance frequency higher than 15 kHz, yielding a servo bandwidth of more than several kHz.

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Magnetics, IEEE Transactions on  (Volume:38 ,  Issue: 5 )