High writability head with robustness against stray field and narrow-track recording properties

A new cusp-field single-pole-type head with a novel structure has been developed. The coil windings of the head are located on both side of the main pole and produce cusped magnetic field to energize the main pole. Dual return-path-yokes are formed in adjacent to the coils. Head field calculations were performed to design the head in terms of high writability. The new head exhibited a small field from the return-path-yoke itself. The writing field amplitude from the main pole was found to increase by reducing the throat height of the main pole without any significant field broadening in cross-track direction. Furthermore, the field gradient could be improved by narrowing the separation between the main pole and the return-path-yoke, resulting in a high linear resolution as confirmed in an experiment. The new head also provided high stray field immunity due to a shielding effect of the dual return-path-yokes.