FLUX CLOSED, EXCHANGE BIASED P1 STRUCTURE
Original Publication Date: 1999-Dec-01
Included in the Prior Art Database: 2003-Jun-12
Thinner shield/pole between the merged MR read and inductive write head is required for higher track density products to achieve acceptable servo performance. Domain instability in common shield/pole is a major concern for the magnetic instability of the advanced MR sensors. We disclose a new laminated shield structure to overcome domain noise. The structure is shown below for about 0.9 um thick shield/pole: Fe-N (2200 A)/Al2O3 (100 A)/(NiO 300 A/NiFe 100 A/Fe-N 500 A)/Al2O3 100 A/Fe-N (2200 A)/ The middle section has eight units of exchange stabilized structure, NiO 300 A/NiFe 100 A/Fe-N 500 A. The total magnetic thickness for Fe-N is about 4400 A for the middle section. The outer sections each have about 2200 A thick Fe-N.