Magnetic recording

Details Magnetic recording Magnetic recording

1983-05-17

1986-06-03

Wolff, John H.

Dynamic magnetic information storage or retrieval

Record medium

360113, G11B 2300

Patent

active

045933367

ABSTRACT:
A permanently structured magnetic recording tape includes a pattern of first and second regions of acicular iron oxide particles, the first `A` regions being orientated at 22.5.degree. (clockwise) to the tapes axis and the second `B` regions being orientated at 67.5.degree. (clockwise) to the tape axis. A permanent magnet applies a developing field at 45.degree. (anti-clockwise) to the tape axis such that, at the transition in orientation direction, the normal components of remanence in `A` and `B` regions are in opposite directions, thereby increasing pole strength at the transitions compared with longitudinal development, and enhancing the output signal at the magnetoresistive read-out transducer.
A second magnetoresistive transducer senses fluctuations in magnetic polarity at the tape edge to verify whether the medium is genuine.

REFERENCES:
patent: 3784796 (1974-01-01), Namikawa
IEEE Transactions on Magnetics, vol. MAG-12, No. 6, Nov. 1976, Titled: "Dual Stripe Magnetoregistive Read Heads for Speed Insensitive Tape Readers".

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