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Lead zirconate titanate (PZT) piezoelectric thin films have been prepared by the sol-gel method to fabricate microcantilever arrays for nano-actuation with potential applications in hard disk drives. Film annealing temperature and time is critical to the preparation of the sol-gel thin film. The fabrication process of microcantilever arrays in planar structure is presented. Key issues for the fabrication of the cantilever are: the compatible etching process of PZT thin film, and the compensation of thin film stress in all layers to obtain a flat multiple layer structure.