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AP-COUPLED STRUCTURE FOR FREE LAYER FOR IMPROVED BIASING

IP.com Disclosure Number: IPCOM000015224D
Original Publication Date: 2001-Dec-25
Included in the Prior Art Database: 2003-Jun-20

Publishing Venue

IBM

Abstract

We disclose a GMR sensor structure of following type: Shield/Al2O3/NiMnO/NiFeCr/PtMn/CoFe/Ru/CoFe/Cu/CoFe(1)/Ru/CoFe(2)/Ta/Al2O3/Shield. In this configuration, CoFe(1) and CoFe(2) layers form antiparallel coupled free layer structure. CoFe(1) layer is chosen thicker than CoFe(2) layer to achieve higher dR/R as well as improved biasing. The current flowing through CoFe(2) layer makes signal asymmetry more near zero. 1