Dynamic magnetic information storage or retrieval – Head – Hall effect
Patent
1998-01-06
1999-07-06
Tupper, Robert S.
Dynamic magnetic information storage or retrieval
Head
Hall effect
G11B 539
Patent
active
059204460
ABSTRACT:
A high sensitivity MR (GMR) sensor suitable for ultra high density magnetic recording applications. The GMR sensor has two laminated free layers each comprising two AP-coupled ferromagnetic layers separated by an antiparallel coupling (APC) layer. The two free layer structures are separated by a non-magnetic, conducting spacer layer. The sense current flowing in the layers of the sensor provide the bias field to set magnetization directions. The applied magnetic field from the magnetic disk rotates one or both of the two free laminated layers due to the moment difference of the composite AP-coupled layers that form the laminated free layers. In the initial state, with zero applied field, the GMR sensor is in the high resistance state. In the final states, with either polarity applied field, the GMR sensor is in the low resistance state. A unipolar output signal is produced as the GMR sensor switches states. The GMR sensor has no pinned layer and no antiferromagnetic layer which reduces the thickness of the MR sensor substantially.
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International Business Machines - Corporation
Saber Paik
Tupper Robert S.
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