Dynamic magnetic information storage or retrieval – General processing of a digital signal – In specific code or form
Patent
1985-09-13
1987-05-05
Canney, Vincent P.
Dynamic magnetic information storage or retrieval
General processing of a digital signal
In specific code or form
360 39, 360 46, G11B 509
Patent
active
046636765
ABSTRACT:
A return-to-zero (RZ) vertical digital magnetic recording method and apparatus comprising a selectively magnetizable recording medium which includes a recording layer of magnetic material having a low vertical remanence. A magnetic recording head is positioned in close proximity to the recording medium, and relative motion is produced between the recording medium and the recording head. To record data, the recording head is energized with one short duration current pulse for each unit of data to be recorded. The resulting bipolar magnetic write field closes substantially perpendicular through the recording medium thereby producing, in the medium, a similarly bipolar flux configuration having the magnetic transition centered about the gap of the magnetic recording head. Data is represented by these transitions in RZ vertical magnetic recording.
REFERENCES:
patent: 4251842 (1981-02-01), Iwasaki et al.
patent: 4286299 (1981-08-01), Shirakata et al.
patent: 4390907 (1983-06-01), Fujiwara
patent: 4442159 (1984-04-01), Dezawa et al.
IBM Tech. Discl. Bull. vol. 24, No. 8, Jan. 1982, p. 4034, entitled "Vertical Record/Read Magnetic Head" by T. A. Schwarz.
Canney Vincent P.
International Business Machines
Schmid, Jr. Otto
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