Recording performance of double sided metal-in-gap composite head

The recording performance of the double-sided MIG (metal-in-gap) composite head was studied and compared to that of the ordinary single-sided head. Double-sided MIG heads have better overwrite performance and improved electrical performance, i.e. output amplitude, bit shift. The overwrite value of double-sided MIG heads is 8 dB higher and achieves less than -30 dB for 1800-Oe media at 0.15 mu m of FH and 0.45 mu m of GL. It is thought that this performance is caused by the strong variations of magnetic moment in the vicinity of Fe-Al-Si film deposited on the trailing edge core.>