An integrated magnetoresistive read, inductive write high density recording head

Abstract
The design, fabrication and performance of an experimental thin film recording head is described which has 25 μm and 125 μm track width magnetoresistive (MR) read elements combined with a single turn thin film inductive write head. The MR read elements are shielded to provide high linear resolution with an equivalent read gap of 1/2 μm and are internally biased by means of a permanent magnet film in the gap. The best head performance with a 0.5 μm air bearing on a high performance disk was: write current of 400 mA peak, isolated pulse readback signal of 40 mV peak per mm of track width at 10 mA sense current, with a 6 db density of 440 flux changes per mm (11 kfci).