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Stamped Structures for Bubble Domain Devices

IP.com Disclosure Number: IPCOM000082570D
Original Publication Date: 1974-Dec-01
Included in the Prior Art Database: 2005-Feb-28
Document File: 2 page(s) / 42K

Publishing Venue

IBM

Related People

Eaton, JH: AUTHOR [+2]

Abstract

Magnetic bubble domains are manipulated using stamped structures, characterized by the absence of magnetic and/or conductor overlays. Fig. 1A shows a substrate having a stamped structure to provide non-uniform thicknesses. Fig. 1B shows a bubble domain material which results when a bubble domain film is deposited on the substrate of Fig. 1A. For instance, an amorphous film can be sputtered on the substrate. The top surface of the amorphous film will be reasonably flat, if the film is approximately four times thicker than the sawtooth depth of the substrate. Therefore, the geometry of the amorphous film is just the inverse of the substrate geometry.

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Stamped Structures for Bubble Domain Devices

Magnetic bubble domains are manipulated using stamped structures, characterized by the absence of magnetic and/or conductor overlays. Fig. 1A shows a substrate having a stamped structure to provide non-uniform thicknesses. Fig. 1B shows a bubble domain material which results when a bubble domain film is deposited on the substrate of Fig. 1A. For instance, an amorphous film can be sputtered on the substrate. The top surface of the amorphous film will be reasonably flat, if the film is approximately four times thicker than the sawtooth depth of the substrate. Therefore, the geometry of the amorphous film is just the inverse of the substrate geometry.

The sawtooth cross-section of the bubble film is used to provide directionality for domain propagation, Since a raised pattern always attracts a bubble domain. For example, when a bias field is modulated to alternately expand and contract a bubble domain, the domain will tend to move to the right since the change of the potential gradient toward the right is more gradual than that toward the left. Since the diameter of a bubble domain has a stable range of about 3:1, it is desirable to select a bubble domain size during contraction which is equal to the sawtooth length. However, the cross-section geometry could be modified so long as the slopes near the rightmost (leading) and leftmost (trailing) portions are different. A sawtooth depth equal to one-fifth of the sawtooth len...