Browse Prior Art Database

Contiguous Disc Bubble Devices Using Ferrofluids

IP.com Disclosure Number: IPCOM000087839D
Original Publication Date: 1977-Mar-01
Included in the Prior Art Database: 2005-Mar-03
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

DeLuca, JC: AUTHOR

Abstract

A magnetic bubble domain device using contiguous disc patterns for movement of bubble domains is fabricated using a ferrofluid layer for the propagation elements.

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Contiguous Disc Bubble Devices Using Ferrofluids

A magnetic bubble domain device using contiguous disc patterns for movement of bubble domains is fabricated using a ferrofluid layer for the propagation elements.

Fig. 1A shows a top view of a bubble domain layer 10 having an overlayer 12 of ferrofluid. An optical mask 14 contains contiguous disc apertures 16. In Fig. 1B, a side view of this structure is shown. Light incident on the mask will evaporate the ferrofluid layer 12 in the portion of the ferrofluid layer not protected by the mask. Accordingly, the ferrofluid layer will be removed in the area of the apertures 16.

The configuration which results is shown in Fig. 2, which illustrates the presence of magnetic bubble domains B at the boundary 18 of the ferrofluid overlayer 12. Since a larger collapse field is required to collapse bubble domains under the ferrofluid and bubbles under the ferrofluid are attracted to the boundary of the ferrofluid, the bubbles B will move along the boundary 18 in response to the reorientation of a magnetic field H in the plane of the ferrofluid overlayer 12.

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