Suppression of magnetic instability in inductive recording heads

Details Suppression of magnetic instability in inductive recording heads Suppression of magnetic instability in inductive recording heads

1992-11-24

1994-05-03

Shepperd, John

Dynamic magnetic information storage or retrieval

General recording or reproducing

Specifics of the amplifier

360 65, G11B 502, G11B 5035

Patent

active

053092988

ABSTRACT:
Circuitry for eliminating magnetic instability of an inductive magnetic transducer during sensing of data from a magnetic recording medium to prevent distortion of the readback signal by hysterically moving domain walls. An inductive sensing coil has an impedance constituting the output impedance of the transducer. Means connected to the coil amplifies a data signal generated by the magnetic flux changes and produces a selected input impedance. The sum of these input and output impedances is selected to be small enough to substantially eliminate motion of the domain walls in the yoke of the transducer while the transducer is sensing data from the medium.

REFERENCES:
patent: 4159489 (1979-06-01), Braitberg
patent: 4280158 (1981-07-01), de Niet
patent: 4470020 (1984-09-01), Mohr
patent: 4956729 (1992-12-01), Yatsugi et al.
patent: 5168397 (1992-12-01), Iwamura et al.
Electronic Design, Sidney A. Friedman Sep. 27, 1969 "Streamline Feedback-Amplifier Design".

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