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Automotive Bubble Lattice Translation

IP.com Disclosure Number: IPCOM000087201D
Original Publication Date: 1976-Dec-01
Included in the Prior Art Database: 2005-Mar-03
Document File: 1 page(s) / 12K

Publishing Venue

IBM

Related People

Argyle, BE: AUTHOR [+2]

Abstract

Present bubble lattice files use large lattices of interacting magnetic bubble domains for storage of information. Generally, domains are coded in terms of their magnetic properties and are removed from the lattice, in order to read the coded information. These lattices usually employ spatial variations in the vertical Z field for lattice translation. The production of such spatial field variations is usually accomplished by sequentially activated current conductors, or by some other type of discrete elements.

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Automotive Bubble Lattice Translation

Present bubble lattice files use large lattices of interacting magnetic bubble domains for storage of information. Generally, domains are coded in terms of their magnetic properties and are removed from the lattice, in order to read the coded information. These lattices usually employ spatial variations in the vertical Z field for lattice translation. The production of such spatial field variations is usually accomplished by sequentially activated current conductors, or by some other type of discrete elements.

In the present translation scheme, no device structure is required for movement of the lattice domains. It has been discovered that an orderly translation of bubble lattice domains can occur without spatially (laterally) modulating the vertical magnetic field H(z). Instead, lattice translation is induced through an appropriate modulation of the amplitude of the field H(z) as a function of time only. The lattice automation is produced with a harmonic as well as with a pulse modulation of H(z), and the effect is sensitive to the specific modulation conditions.

Parameters ufor control of lattice translation in the present technique include the frequency of modulation and the pulse shape. Depending upon the pulse width in the case of pulse modulation or the frequency of sinusoidal modulation, the translation direction can be reversed. Typical translation distances are in the order of 1 micrometer per pulse at modulation amp...