Perpendicular magnetic recording and perpendicular magnetic repr

Details Perpendicular magnetic recording and perpendicular magnetic repr Perpendicular magnetic recording and perpendicular magnetic repr

1992-10-14

1999-11-23

Cao, Allen T.

Dynamic magnetic information storage or retrieval

Head

Core

G11B 5127

Patent

active

059911263

ABSTRACT:
The present invention is directed to a perpendicular magnetic recording apparatus and a perpendicular magnetic reproducing apparatus which can achieve high-density recording and high output reproduction. The perpendicular magnetic recording medium (2) is used which has a perpendicular magnetic film made of chiefly Co, Pt and a vertical coercive force of 1500 Oe or above. This recording medium is recorded by the magnetic head (4) of which at least the magnetic gap portion is formed of the soft magnetic thin film (3). This soft magnetic thin film (3) contains chiefly Fe and has a saturation magnetic flux density 4.pi.Ms of 19 kG or above.

REFERENCES:
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patent: 4894098 (1990-01-01), Otomo et al.
patent: 5147732 (1992-09-01), Shiroishi et al.
Hayashi et al, "CoPtB(0) alloy films as new perpendicular recording media", J. Appl. Phys., vol. 67, No. 9, May 1, 1990, pp. 5175-5177.
Hayashi et al, "Magnetic Properties and Microstructure of Co-Pt-B-O Alloy Films", Mat. Res. Soc. Symp. Proc. vol. 232, 1991, pp. 35-46.
Katori et al, "Soft magnetic Fe-Al-N/Si-N multilayered film with higher thermal stability", Appl. Phys. Lett., vol. 54, No. 12, Mar. 20, 1989, pp. 1181-1182.
Abstract of Japanese Published Application 61-242310 (Oct. 28, 1986), Patent Abstracts of Japan, vol. 11, No. 091 (P558), Mar. 23, 1987.
Abstract of Japanese Published Application 2-73511 of Mar. 13, 1990, Patent Abstracts of Japan, vol. 14, No. 267 (P1058), Jun. 8, 1990.

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