Browse Prior Art Database

T Bar Array for Bubble Domain Devices

IP.com Disclosure Number: IPCOM000073875D
Original Publication Date: 1971-Feb-01
Included in the Prior Art Database: 2005-Feb-23
Document File: 2 page(s) / 35K

Publishing Venue

IBM

Related People

Lin, YS: AUTHOR

Abstract

This double overlay permalloy pattern provides higher propagation speeds for magnetic bubble domain devices. Rather than a single permalloy overlay on one side of the magnetic chip in which bubble domains exist, a permalloy overlay is provided on both sides of the chip. A bias magnetic field Hz, is applied normal to the magnetic chip to maintain single wall bubble domains of constant size. A rotating, in-plane magnetic field H is provided for propagation of the domains to repetitively produced magnetic poles on the permalloy patterns. The double overlays increase the magnetic field poles and thereby increase the domain propagation speed. The two overlays are arranged such that the magnetic fields associated with each overlay are added during each propagation field direction (i.e., 1, 2, 3, and 4 of an in-plane field H).

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T Bar Array for Bubble Domain Devices

This double overlay permalloy pattern provides higher propagation speeds for magnetic bubble domain devices. Rather than a single permalloy overlay on one side of the magnetic chip in which bubble domains exist, a permalloy overlay is provided on both sides of the chip. A bias magnetic field Hz, is applied normal to the magnetic chip to maintain single wall bubble domains of constant size. A rotating, in-plane magnetic field H is provided for propagation of the domains to repetitively produced magnetic poles on the permalloy patterns. The double overlays increase the magnetic field poles and thereby increase the domain propagation speed. The two overlays are arranged such that the magnetic fields associated with each overlay are added during each propagation field direction
(i.e., 1, 2, 3, and 4 of an in-plane field H). Increased propagation speed is provided over the entire magnetic chip due to this arrangement.

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