Dynamic magnetic information storage or retrieval – Head – Hall effect
Patent
1979-12-11
1981-10-20
Wolff, John H.
Dynamic magnetic information storage or retrieval
Head
Hall effect
324252, 338 32R, G11B 530
Patent
active
042964474
ABSTRACT:
A magnetic tape recording head comprises a strip of magneto-resistive material whose magnetic field/resistance change characteristic is in the form of two mirror image nonlinear curves starting at the origin of the graph. The strip is energized with a constant current and the voltage across it is fed to two sample and hold circuits. These are respectively triggered by antiphase pulses and the samples from the two sample and hold circuits are fed to the respective inputs of a differential amplifier. A bias conductor alongside the magneto-resistive strip is energized with pulses having the same polarity as, and synchronous with, the sampling pulses so as to bias the strip to predetermined points which are alternately on the positive and negative parts of the graph. The overall effective characteristic is therefore the sum of one part of the graph and the inverted other part, and is substantially linear.
REFERENCES:
patent: 3860965 (1975-01-01), Voegeli
patent: 3864751 (1975-02-01), Beaulieu et al.
patent: 4050086 (1977-09-01), Harr
patent: 4179720 (1979-12-01), Miura
patent: 4191977 (1980-03-01), Lewkowicz
IBM/TDB, vol. 15, No. 9, Feb. 1973, "Balanced Magnetic Head" by O'Day.
Racal Recorders Ltd.
Wolff John H.
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