Browse Prior Art Database

Translational Pulse Modulation to Overcome Coercivity

IP.com Disclosure Number: IPCOM000086349D
Original Publication Date: 1976-Aug-01
Included in the Prior Art Database: 2005-Mar-03
Document File: 2 page(s) / 35K

Publishing Venue

IBM

Related People

Franich, DM: AUTHOR

Abstract

The use of applying an external or off-chip alternating magnetic field (tickle field) to reduce the coercivity of a bubble chip, has been described by Dejong et al in 1971 at the Magnetism and Magnetic Materials Conference and in the Smith et al patent U. S. 3,820,039.

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Translational Pulse Modulation to Overcome Coercivity

The use of applying an external or off-chip alternating magnetic field (tickle field) to reduce the coercivity of a bubble chip, has been described by Dejong et al in 1971 at the Magnetism and Magnetic Materials Conference and in the Smith et al patent U. S. 3,820,039.

The use of applying a tickle field signal directly to a bubble chip by mixing it with a translational signal is described herein and shown schematically in the figure.

The mixing of a tickle field signal with a translational signal reduces the coercivity in the specific area where it is desired, i.e., where the bubbles are being moved. This system has several advantages. One advantage is that it eliminates the off-chip tickle field, thereby simplifying the packaging of the bubble device. Another advantage is that the operating margin of the bubble chip is significantly increased.

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