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Bubble Domain Sensing at Superconducting Temperatures

IP.com Disclosure Number: IPCOM000076105D
Original Publication Date: 1972-Jan-01
Included in the Prior Art Database: 2005-Feb-24
Document File: 2 page(s) / 43K

Publishing Venue

IBM

Related People

Argyle, BE: AUTHOR [+3]

Abstract

This system refers to the use of superconductive sensors for use as detectors of magnetic bubble domains.

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Bubble Domain Sensing at Superconducting Temperatures

This system refers to the use of superconductive sensors for use as detectors of magnetic bubble domains.

The most popular materials that can support bubble domains operate at room temperature. Garnets and orthoferrites are examples of room temperature materials. However, the number of possible bubble domain materials that can be used at cryogenic temperatures, i.e., in the vicinity of 4.2 degrees K, is much greater than those whose use is limited to room temperature. Additionally, not only does one have the advantage of greater choice of bubble domain materials at cryogenic temperatures, but detectors of such bubbles, at cryogenic temperatures, are very sensitive.

In Fig. 1, the entire bubble domain memory unit 2, of a suitable material capable of generating and propagating bubble domains therein, is placed in a cryostat 4 that maintains the memory at a temperature near absolute zero. Bubbles B are generated within the memory unit 2 and are propagated along the length of that memory unit, both the bubble generation and propagating means are not shown in that they are conventional features. An insulating film 6 of silicon or the like is deposited over the top surface of the bubble domain material and thin films of metal 8 are disposed atop of the silicon, along the length of the bubble domain material. Any of the low-critical field metals such as Ga, Cd, Zn and Al can be chosen as the superconductive sensing f...