Dynamic magnetic information storage or retrieval – Head – Magnetoresistive reproducing head
Reexamination Certificate
2006-10-30
2009-06-09
Evans, Jefferson (Department: 2627)
Dynamic magnetic information storage or retrieval
Head
Magnetoresistive reproducing head
C360S323000
Reexamination Certificate
active
07545608
ABSTRACT:
A current-perpendicular-to-the-plane (CPP) magnetoresistive (MR) read head structure has the MR read head located between first and second shields (S1, S2) on a substrate with a shunt resistor R1connecting S1to the substrate and a shunt resistor R2connecting S2to the substrate, with R1and R2being approximately equal. Because R1and R2are close enough in value there is no significant interference pickup in the low frequency region. The shunt resistors can be formed from high-resistivity metal nitrides or cermets. The spacing between the substrate and S1may be selected to make the capacitance between S1and the substrate approximately equal to the capacitance between S2and the substrate to substantially reduce interference pickup in the high frequency region. Equalization conductors (EC1, EC2) may be connected to the substrate and spaced from S2and S1, respectively, by electrically insulating material to create additional capacitances with values selected to substantially equalize the total parasitic capacitance on S2with the total parasitic capacitance on S1.
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Araki Satoru
Contreras John
Klaassen Klaas Berend
Patterson Ramona Marie
Seagle David John
Berthold Thomas R.
Evans Jefferson
Hitachi Global Storage Technologies - Netherlands B.V.
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