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In relation to high capacity magneto-optical recording, a new electrostatic actuator, which is called a micro lens actuator (MLA), for an optical flying head (OFH) has been designed and fabricated. The MLA is characterized by its moving electrode made of a Pd-based thin film metallic glass ( Pd/sub 76/Cu/sub 7/Si/sub 17/). Annealing in the supercooled liquid region (SCLR) is adopted for relaxation of internal stress in the moving electrode to fabricate a huge, flat and thin moving electrode plate. The experimental MLA shows 0.85 /spl mu/m/50 V maximum stroke, 0.02 degree tilt error and 3.55 kHz resonance frequency.