Dynamic magnetic information storage or retrieval – Head – Hall effect
Patent
1997-04-03
1999-01-12
Letscher, George J.
Dynamic magnetic information storage or retrieval
Head
Hall effect
G11B 539
Patent
active
058597549
ABSTRACT:
Magnetic transducers are formed with common magnetic exchange layers capable of providing assertive and complementary signals. The transducers include an assertive transducer portion and a complementary transducer portion. Between the two transducer portions is a common bias portion which comprises an antiferromagnetic layer providing bias fields in different directions to the respective transducer portions. During normal operations, a current is directed into each of the transducer portions. The assertive transducer portion, being magnetically biased in one direction, generates a varying voltage as an assertive version of the electrical signal. The complementary transducer, being magnetically biased in another direction, generates another varying voltage as a complementary version of the electrical signal. In one embodiment, the transducer portions are implemented to operate as an anisotropic MR(AMR) sensor. In a second embodiment, the transducer portions operate as a giant MR(GMR) or spin valve sensor.
REFERENCES:
patent: 5408377 (1995-04-01), Gurney et al.
patent: 5612098 (1997-03-01), Tan et al.
Liu Francis H.
Rottmayer Robert Earl
Tan Minshen
Tong Hua-Ching
Yuan Samuel W.
Kallman Nathan N.
Letscher George J.
Read-Rite Corporation
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