Dynamic magnetic information storage or retrieval – Head
Patent
1990-11-07
1992-06-02
Heinz, A. J.
Dynamic magnetic information storage or retrieval
Head
360119, 360122, 360126, G11B 5127, G11B 523, G11B 5147
Patent
active
RE0339490
ABSTRACT:
The present device provides a downstream magnetic shield which is integrally formed with a write pole section having a tip to make up a magnetic recording head. The shield and the write pole tip are located with small gap therebetween, so that magnetic flux which fringes from the magnetic write pole tip is intercepted by the shield. Accordingly such fringing flux does not pass through the recording medium, and hence if a data bit has been written into the recording medium its dipole identity will not be weakened by the fringing flux of a subsequent data bit being written into the magnetic recording medium. In addition, the magnetic recording medium is made up of a first layer of material having perpendicular uniaxial anisotropy and an underlying layer made of a material which has a low magnetic flux reluctance characteristic. Accordingly, the magnetic flux passes vertically through the first layer, along the second layer and finally passes vertically from the second layer through the first layer into the shield. The face of the shield is designed to be many times as large as the face of the write pole section so that the density of the flux from the tip is sufficient to effect a vertical recording while the density of the flux passing into the downstream magnetic shield is low and hence a previously recorded pattern is not reversed.
REFERENCES:
patent: 3156919 (1964-11-01), Rutter
patent: 4575777 (1986-03-01), Hosokawa
Iwasaki, et al., "An Analysis For The Magnetization Mode For High Density Magnetic Recording", IEEE Trans. on Magnetics, V MAG-13, No. 5, Sep. 1977 pp. 1272-1277.
Potter, et al., "Self-Consistent Computer Calculations For Perpendicular Magnetic Recording", IEEE Trans. on Magnetics, vol. MAG-16, No. 5, Sep. 1980, pp. 967-972.
Lazzari, et al., "Thin-Film Head Study For Perpendicular Recording", IEEE Trans. on Magnetics, vol. MAG-17, No. 6, Nov. 1981, pp. 3120-3121.
Hanazono, et al., "Fabrication Of A Thin Film Head Using Polyimide Resin And Sputtered Ni-Fe Films.sup.a) ", J. Appl. Phys. 53(3), Mar. 1982, pp. 2608-2610.
Shinagawa, et al., "Simulation Of Perpendicular Recording On Co-Cr Media With A Thin Permalloy Film-Ferrite Composite Head", J. Appl. Phys. 53(3), Mar. 1982, pp. 2585-2587.
Oshiki, et al., "A Thin Film Head For Perpendicular Magnetic Recording", J. Appl. Phys. 53(3), Mar. 1982, pp. 2593-2595.
Das Shyam C.
Mallary Michael L.
Digital Equipment Corporation
Heinz A. J.
LandOfFree
Vertical magnetic recording arrangement does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Vertical magnetic recording arrangement, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Vertical magnetic recording arrangement will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2220606