An HGA includes a head slider with at least one head element, a support and a
precise positioning actuator fixed with the head slider and with the support for
precisely positioning the at least one head element. The actuator includes a pair
of movable arms capable of displacing in response to a drive signal applied to
the actuator, for catching the head slider in a space between the movable arms.
Each of the movable arms includes an arm member being made of an elastic sintered
ceramic and having substantially the same cross sectional shape from a root thereof
to a top end thereof, and a piezoelectric element formed on a side surface of the
arm member. A spacing between base ends of the arm members is larger than a spacing
between top ends of the arm members.
