Design of a metal-in-gap head for higher coercivity media

The authors describe the design of a metal-in-gap head for high coercivity (>2 kOe) media by using the finite-element method. The secondary field at the metal-ferrite interface as well as the recording field strength and the recording field gradient is taken into consideration for the various structures of metal-in-gap heads. It is shown that by setting the film thickness of the trailing side larger than that of the leading side the secondary field can be reduced. Measured results have shown the validity of the design concept and that 33 dB of overwrite is obtained on the high coercivity (H_c=2150 Oe) medium by the designed head