KEEPERED MEDIA REPRODUCTION WITH DUAL MR HEADS

The key technique in applying keepered media system in a reproduction is how to ''open'' the keeper layer. In this paper we propose a new co ncept of keepered-media-reproduction with Dual Magnetoresistive (DMR) heads. The keeper layer may be biased by the stray Bur from DMR sensor s. The shunting-releasing ratio between reproduced signals without and with a sense current is found to be - 26 dB. This media system is com pletely stable against thermal demagnetization. It is believed that ke epered media may offer a similar advantage with MR heads and potential ly allow magnetics to break the 10 Gb/in(2) areal density barrier with the aid of the high performance gains of MR heads.