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We disclose GMR sensor passive area pinning using Antiparallel Tabs (AP-TAB) which utilize high Hc material (E.g. CoPtCr) for these Antiparallel Tabs.
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AP-TAB USING HARD MATERIAL
The layers in the active area of the sensor are: Al2O3/NiFeCr/NiFe/PtMn/CoFe/Ru/CoFe/Cu/CoFe/NiFe/Ru/Ta The layers in the passive track edge area (AP-TAB) location are: Al2O3/NiFeCr/NiFe/PtMn/CoFe/Ru/CoFe/Cu/CoFe/NiFe/Ru/CoPtCr/Ta/Rh/Ta CoFe/NiFe/Ru/CoPtCr stack in bold is the Antiparallel TAB (AP-TAB) which exists on each track edge. CoPtCr high Hc layer provides pinning to the AP-TAB. The purpose of the AP-TABs is to define the narrow magnetic read track by eliminating the side reading.