Keepered-Perpendicular-Media Reproduction with Dual MR Heads

The key technique to apply keepered media system is how to" open" the keepered layer. In this paper, we wonld propose a new concept of keepered-media-reproduction with Dual MR heads. The keeper layer could be biased by the stray flux from DMR sensors. The shunting-releasing ratio between reproductive signals without and with sense current is found to be-26.6 dB. This is a completely-stable medium system against thermal demagnetization. It is believed that keepered media may offer a similar advantage with MR heads and potentially allow magnetics to break the 10 Gb/in2 areal density barrier due to the high performance gains of MR heads.