Controlled magnetic recording head relaxation in a magnetic reco

Details Controlled magnetic recording head relaxation in a magnetic reco Controlled magnetic recording head relaxation in a magnetic reco

1990-05-02

1992-12-01

Psitos, Aristotelis

Dynamic magnetic information storage or retrieval

General processing of a digital signal

Head amplifier circuit

360 68, G11B 509, G11B 502

Patent

active

051683954

ABSTRACT:
A magetic recording system includes a current-tapering circuit which gradually reduces the WRITE current in a magnetic recording head to zero over a time interval on the same order of magnitude as the characteristic relaxation time of the domain patterns in the magnetic recording head, rather than abruptly. Specific embodiments of the current-tapering circuit create a down-sloping ramp, a decaying exponential curve, and a high-frequency burst. The resultant magnetic recording system has reduced Barkhausen noise and reproducible READ performance as well as improved READ sensitivity following a WRITE operation.

REFERENCES:
patent: 3009637 (1961-11-01), Floros
patent: 3618119 (1971-11-01), Rodriguez
patent: 4428008 (1984-01-01), Fawkes
patent: 4649447 (1987-03-01), Huang et al.
patent: 4651235 (1987-03-01), Morita et al.
patent: 5067032 (1991-11-01), Ida
V. C. Martin, Full Erasure of Interblock Gap Between Records on Magnetic Tape, IBM TDB, Jul. 1972, vol. 15, No. 2, pp. 641-642.

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