Wavering conductor loops for magnetic domain memories

Details Wavering conductor loops for magnetic domain memories Wavering conductor loops for magnetic domain memories

1976-07-01

1977-12-20

Moffitt, James W.

Static information storage and retrieval

Magnetic bubbles

Conductor propagation

365 8, 365 17, 365 40, 365 35, G11C 1908

Patent

active

040644960

ABSTRACT:
Disclosed are magnetic domain (bubble) memory arrays and correlator type memory arrays in uniaxially anisotropic crystals which utilize wavering loop conductor patterns at each bit location defining three contiguous magnetic domain retaining regions. On current reversal a bubble in the center loop of a wavering loop pattern will be equally attracted to either of the outside loops. Decision control is provided by a second array of two conductor lines interposed between the respective domain retaining regions. These control conductors establish an aiding or inhibiting magnetic field when current flows through them. In an alternate design a correlator function is obtained by using bubbles retained in previously disclosed bistable loops as memory elements and interrogating them by means of auxiliary bubbles driven by adjacent wavering loops. In operation, the bistable conductor loops defining the two memory states are placed on either side of a crystalline platelet to jointly define two domain retaining memory regions. The presence of a bubble at either memory site is sensed by its repulsion of an adjacent interrogating bubble controlled by a wavering loop pattern. Magnetoresistive sensors are placed in sensing relationship to one of the three regions defined by the wavering loop conductor pattern.

REFERENCES:
IBM Technical Disclosure Bulletin - vol. 14, No. 7, Dec. 1971, pp. 2144-2145.

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