Ryo Goto

Low inductance double-sided Metal-In-Gap nano composite slider using Fe-Ta-N magnetic film system for 250 Mb/in/sup 2/ recording

We studied some characteristics of a double-sided Metal-In-Gap (DMIG) nano composite slider that has a low inductance structure, Fe-Ta-N type of magnetic film and new geometrical configuration of the gap area. The inductance of this head is approximately 1.0 nH/T/sup 2/. The electrical performance of this head has been evaluated with 5.5 /spl mu/m Track Width and 0.25 /spl mu/m Gap Length for 1800 Oe media. O/W is less than -34 dB at 53 kFCI. Output voltage is more than 150 nVp-p/(um.m/s.turns) at 53 kFCI. This performance is seen to be promising for 250 Mb/in/sup 2/ recording. >

A double sided metal-in-gap head for 150 Mb/in/sup 2/ recording

The performance of double-sided metal-in-gap (D-MIG) composite heads has been evaluated on thin-film media of various coercive forces. The O/W of D-MIG was better than that of the single-sided one because of its higher intensity of the recording magnetic field. The total signal-to-noise ratio (SNR) of a D-MIG on a medium of 1600 Oe was better than that on a medium of 1250 Oe. Consequently, for a D-MIG, predicted recording density extended to 150 Mb/in/sup 2/ on a medium of 1600 Oe with the criterion of O/W(-28 dB) and total SNR (31 dB). >

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. >