Dynamic magnetic information storage or retrieval – Head – Hall effect
Reexamination Certificate
2005-02-28
2008-10-21
Renner, Craig A (Department: 2627)
Dynamic magnetic information storage or retrieval
Head
Hall effect
Reexamination Certificate
active
07440227
ABSTRACT:
A magnetic head has a sensor which employs the “Hall effect”. In one illustrative example, the sensor includes a generally planar body made of a semiconductor heterostructure; first and second contacts comprising first and second drains, respectively, which are formed over a first end of the body and spaced equally apart from a centerline of the body; and a third contact comprising a source formed over a second end of the body which is opposite the first end of the body. The semiconductor heterostructure is comprised of a high mobility two-dimensional electron or hole gas close to an air bearing surface (ABS) of the magnetic head so as to be exposed to magnetic field lines substantially normal to it from magnetically recorded bits. Advantageously, the sensor does not require magnetic materials utilized in conventional sensors and therefore does not suffer from magnetic noise associated therewith.
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Chattopadhyay Amitava
Gurney Bruce Alvin
Maat Stefan
Marinero Ernesto E.
Hitachi Global Storage Technologies - Netherlands B.V.
Oskorep, Esq. John J.
Rambod Nader
Renner Craig A
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