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Ion Implanted Bubble Generator

IP.com Disclosure Number: IPCOM000088984D
Original Publication Date: 1977-Aug-01
Included in the Prior Art Database: 2005-Mar-04
Document File: 2 page(s) / 40K

Publishing Venue

IBM

Related People

Dekker, P: AUTHOR [+2]

Abstract

Magnetic bubble domains can be nucleated in a region of a bubble film adjacent to an ion-implanted region of the film. If nucleation occurs in the absence of an in-plane magnetic field, the bubbles will have an S = 1 state, while if an in-plane magnetic field is present, S = 0 bubbles are nucleated. The S = 1 bubbles deflect at an angle to an applied gradient magnetic field, while the S = 0 bubbles propagate in the direction of the gradient. These conditions of bubble nucleation are inconsistent and require the application of strong local in-plane magnetic fields for generation of the S = 0 bubbles. However, if long range in-plane magnetic fields exist, S = 1 bubbles elsewhere in the magnetic film might be destroyed.

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Ion Implanted Bubble Generator

Magnetic bubble domains can be nucleated in a region of a bubble film adjacent to an ion-implanted region of the film. If nucleation occurs in the absence of an in-plane magnetic field, the bubbles will have an S = 1 state, while if an in-plane magnetic field is present, S = 0 bubbles are nucleated. The S = 1 bubbles deflect at an angle to an applied gradient magnetic field, while the S = 0 bubbles propagate in the direction of the gradient. These conditions of bubble nucleation are inconsistent and require the application of strong local in-plane magnetic fields for generation of the S = 0 bubbles. However, if long range in- plane magnetic fields exist, S = 1 bubbles elsewhere in the magnetic film might be destroyed.

In order to eliminate this problem, it is proposed to nucleate only S = 0 bubbles in the generator, and to bring these S = 0 bubbles out of the implanted generator region by gradient propagation. The S = 0 bubbles are then converted, in the presence of a strong in-plane magnetic field, into either S = +1 or S = -1 bubbles, by subjecting the bubble to a strong gradient field. Typical values for one GdTm-iron garnet film were the following:

(Image Omitted)

The structure for generation of S = 0 and S = 1 bubble domains is shown in Fig. 1. A bubble domain film 10 has an ion-implanted region 12 therein, in which S = 0 bubbles B are generated. A plurality of current-carrying conductors 14 provide the gradient magnetic field to move bubble domains i...