Thin film magnetic transducers.

摘要

A thin film magnetic transducer for reading and writing a track on a magnetic recording medium consists of layers deposited on a deposition surface of a non-magnetic substrate (20) which has an air bearing surface (ABS) at right angles to the deposition surface. Two of the layers (14, 15) are of magnetic material to form a yoke (13) with a pole tip region having a transducing gap (18) at the air bearing surface(ABS), and with a back region. A read/write coil (10a to 10h) is coupled to the back region.
<??>The pole tip region has a width approximating to track width and a length (D) of approximately 5/d where d is the recording density on the recording medium in order to minimise signals from adjacent tracks and maximise read resolution.
<??>The thickness and width of the layers (14, 15) in the back region are greater than those dimensions in the pole tip region, the increase in width being provided by a taper. The width of the back region is greater than the width of the pole tip region, the wider back region tapering to join the pole tip region. Also the thickness of the back region magnetic layers (14,15) is at least 60% greater than the thickness of the pole tip region. The back region is designed taking into account saturation to provide an efficient write operation.