Browse Prior Art Database

Bubble Generation Device

IP.com Disclosure Number: IPCOM000075467D
Original Publication Date: 1971-Sep-01
Included in the Prior Art Database: 2005-Feb-24
Document File: 2 page(s) / 31K

Publishing Venue

IBM

Related People

Albert, P: AUTHOR [+3]

Abstract

In magnetic domain systems it is desirable to use the same field strengths for both generation of the domains and propagation of the domains through the array.

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Bubble Generation Device

In magnetic domain systems it is desirable to use the same field strengths for both generation of the domains and propagation of the domains through the array.

It is known that T-I permalloy patterns, on the surface of a sheet of magnetic material in which magnetic domains can be propagated, exhibit changing magnetic pole patterns in response to a field rotating through 360 degrees in the plane of the sheet, and that these patterns can be arranged in conjunction with a domain generator such that a domain can be generated, introduced into the T-I pattern and moved through the sheet.

Known domain generators, as shown in Fig. 1, comprise a circular permalloy pattern 10 on the surface of a sheet 11. The pattern 10 has a single protrusion 12 directed towards the first I bar 14 of a T-I pattern 16. When a rotating in-plane electric field, following a prolate trochoidal path, passes through the sheet 11, a magnetic field becomes applied to the circular pattern 10. Such a domain is generated under pattern 10 and follows the edge of pattern 10 until it reaches the point on pattern 10 where a magnetic pole 17 is located. Because of the magnetic field at this pole, the domain is cut away from the pattern 10 and directed into the T-I pattern 16.

Thus the domain follows the cross hatched path 20.

With the generator of Fig. 1, high-generating fields, in the order of twenty oersteds are required, even though domain propagation through the T-I pattern 16...