Browse Prior Art Database

Bubble Nucleation

IP.com Disclosure Number: IPCOM000074171D
Original Publication Date: 1971-Mar-01
Included in the Prior Art Database: 2005-Feb-23
Document File: 2 page(s) / 32K

Publishing Venue

IBM

Related People

Bogholtz, WE: AUTHOR [+5]

Abstract

A domain wall device has a platelet 1 of orthoferrite or like material. In such a device, it is necessary to be able to nucleate the first starting or "Mother" bubble for use in any bubble generation scheme. This is accomplished by two permalloy bars 2 and 3, splitter loops 4 and 5 and a holding loop 6.

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Bubble Nucleation

A domain wall device has a platelet 1 of orthoferrite or like material. In such a device, it is necessary to be able to nucleate the first starting or "Mother" bubble for use in any bubble generation scheme. This is accomplished by two permalloy bars 2 and 3, splitter loops 4 and 5 and a holding loop 6.

In the demagnetized state, platelet 1 has many stripes. One stripe 7 is trapped between bars 2 and 3. Loops 4 and 5 can be pulsed so that the induced magnetic fields split stripe 7 to form a central elongated domain 8 and two end domains 9 and 10. By increasing the magnetic fields around loops 4 and 5, domain 8 can then be formed into a bubble 11. This bubble can then be pulled by holding loop 6 into position 12 so as to guarantee a fixed starting position for bubble generation.

As an alternative to using bars 2 and 3, platelet 1 can have two scratches located at the positions of bars 2 and 3. Such scratches are effective to trap a stripe.

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