Browse Prior Art Database

Herringbone Bubble Domain Funnels and Decoders

IP.com Disclosure Number: IPCOM000076260D
Original Publication Date: 1972-Feb-01
Included in the Prior Art Database: 2005-Feb-24
Document File: 2 page(s) / 57K

Publishing Venue

IBM

Related People

Lin, YS: AUTHOR

Abstract

A funnel circuit using herringbone permalloy patterns is shown in Figs. 1A and 1B, while a decoder circuit using herringbone permalloy patterns is shown in Figs. 2A, 2B, 3 and 4. In these circuits, transfer between propagation channels is provided by permalloy wedges located between the channels.

This text was extracted from a PDF file.
At least one non-text object (such as an image or picture) has been suppressed.
This is the abbreviated version, containing approximately 53% of the total text.

Page 1 of 2

Herringbone Bubble Domain Funnels and Decoders

A funnel circuit using herringbone permalloy patterns is shown in Figs. 1A and 1B, while a decoder circuit using herringbone permalloy patterns is shown in Figs. 2A, 2B, 3 and 4. In these circuits, transfer between propagation channels is provided by permalloy wedges located between the channels.

Fig. 1A is a block diagram of the funnel circuits shown in Fig. 1B. This funnel accepts 2/N/ inputs of a read decoder and channels them to a single detector. The herringbone pattern is comprised of permalloy deposited on a magnetic bubble domain material, such as orthoferrite. Propagation is in accordance with the applied magnetic field components Hx and Hy.

In Fig. 1B, eight shift register inputs are connected to the funnel circuit. Domain propagation in the funnel is achieved by shifting magnetic charges induced on the zig-zag patterns to attract bubble domains, thereby moving then. At the end of each channel a L-shaped permalloy bar and two permalloy wedges are used to channel the bubble to a detector, without the use of control lines. For instance, a bubble domain BD entering the funnel from channel 2 propagates to position 1. During a subsequent field cycle the bubble domain will follow the path 1, 2, 3, 4 to the detector. This structure requires a small amount of space and delay time within the device is minimized.

A herringbone permalloy pattern is used to make a decoder circuit, as shown in Figs. 2A and 2B. This decoder selects one of 2/N/ shift...