Micromagnetic memory package

Static information storage and retrieval – Magnetic bubbles – Disposition of elements

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365 53, G11C 504, G11C 1908

Patent

active

048842354

ABSTRACT:
A package comprised of a plurality of truncated confocal, ellipsoidal layers of substantially equal length and having a common opening therethrough along a central axis for receiving a micromagnetic memory therein, typically a vertically stacked bubble memory. The layers include at least one outermost layer of first type ferromagnetic material having a permeability for providing a shield against external fields, at least one inner layer of a second type ferromagnetic material having a permanent magnetization for producing a static, internal, uniform bias field transverse to the central axis for a bubble memory element of the memory, two adjacent layers of electromagnetic coils for generating an internal time varying transverse and axial fields for controlling the bubble memory element, and preferably at least one "leaky shield" layer of a third type ferromagnetic material interposed between the inner layer of second type ferromagnetic material and the electromagnetic coil layers for providing a flux return path fot the field generated by the coil layer and increasing the permeance of the inner layer of second type ferromagnetic material.

REFERENCES:
patent: 3971126 (1976-07-01), Buhrer
patent: 4017604 (1977-04-01), Naden et al.
patent: 4018491 (1977-04-01), Niedzwiecke et al.

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