Browse Prior Art Database

Anglefish Circuit Using In Plane Propagation Fields

IP.com Disclosure Number: IPCOM000082923D
Original Publication Date: 1975-Feb-01
Included in the Prior Art Database: 2005-Feb-28
Document File: 2 page(s) / 37K

Publishing Venue

IBM

Related People

Lin, YS: AUTHOR

Abstract

In contrast with the usual angelfish circuit for moving magnetic bubble domains, the present angelfish circuit uses a rotating, in-plane magnetic field for movement of domains. This enhances the operating margin of the circuit, since the bias field need not be modulated uniformly as with prior art angelfish devices.

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Anglefish Circuit Using In Plane Propagation Fields

In contrast with the usual angelfish circuit for moving magnetic bubble domains, the present angelfish circuit uses a rotating, in-plane magnetic field for movement of domains. This enhances the operating margin of the circuit, since the bias field need not be modulated uniformly as with prior art angelfish devices.

Fig. 1A shows a side view of the propagation structure in which the bubble domain material 10, such as a garnet, has a thin permalloy strip 12 deposited thereon. On top of strip 12 is a propagation pattern comprising permalloy wedges 14. A bubble domain BD is shown in the material 10.

In Fig. 1B, the bubble domain BD is shown in a rest position and in a position where it is elongated. This elongation is due to the presence of the in-plane field
H.

A bubble domain located in proximity to a thin permalloy layer on the bubble material can be modulated in shape, according to the direction of the field H. This is due to a variation of the magnetostatic coupling strength along the domain perimeter. For example, Fig. 2 shows the variation in shape of a bubble domain in response to two orientations of the field H. As is apparent, the domain elongates in a direction opposite to the direction of applied field.

In the absence of in-plane fields, the magnetostatic coupling from thin permalloy layer 12 expands the domain BD along the radial direction uniformly and the magnetization distribution in the permalloy f...