Three-dimensional magnetic memory medium and method for initial

Details Three-dimensional magnetic memory medium and method for initial Three-dimensional magnetic memory medium and method for initial

1988-11-29

1992-04-07

Popek, Joseph A.

Static information storage and retrieval

Magnetic bubbles

Multiple magnetic layer

365 38, 365173, G11C 1908

Patent

active

051034220

ABSTRACT:
A three-dimensional magnetic memory medium which comprises a substrate, a plurality of magnetic layers and a plurality of nonmagnetic layers. The magnetic layers and the nonmagnetic layers are alternately stacked one above the other on the substrate. Each magnetic layer comprises a transfer area, wherein assuming that n is a positive even whole number, the (n-1)th magnetic layer (the 3rd layer, the 5th layer, the 7th layer, . . .) has a transfer pattern different from that of the nth magnetic layer (the 2nd layer, the 4th layer, the 6th layer, . . .). An uppermost magnetic layer is used as a signal writing area and as a signal reading area. A position corresponding to a signal "1" and a position corresponding to a signal "0" are arranged in the signal writing area at a position superposed on a position of "1" and on a position of "0" in a transfer pattern of the (n-1)th magnetic layer, respectively. A guide line is provided in the signal writing area so that a magnetic bubble is movable between the position of a signal "1" and the position of a signal "0" along the guide line.

REFERENCES:
patent: 4052711 (1977-10-01), Lin et al.
M. Kaneko et al., "Optical Operation of a Magnetic Bubble", IEEE Transactions on Magnetics, vol. MAG-22, No. 1, pp. 188-196, Jan. 1986.

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