Apparatus for latching an actuator, such as used in a data storage device.
A moveable electrical coil is disposed adjacent a magnetically permeable
structure. The coil is latched by magnetic flux passing across a gap
extending into the structure which establishes a retention force upon the
coil. The coil is subsequently unlatched by application of current to the
coil which reduces the magnetic flux across the gap and hence, the
magnitude of the retention force upon the coil. The current also
concurrently induces movement of the coil away from the gap. The
structure preferably comprises a unitary, c-shaped structure comprising a
base member, a support member and a pole member, with the coil configured
to surround and travel along a lateral extent of the pole member. A
permanent magnet is nested on the base member. A plate is preferably
coupled to the coil for abutment across the gap.