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Bubble Domain Splitter Using Herringbone Permalloy Pattern

IP.com Disclosure Number: IPCOM000076247D
Original Publication Date: 1972-Feb-01
Included in the Prior Art Database: 2005-Feb-24
Document File: 2 page(s) / 40K

Publishing Venue

IBM

Related People

Keefe, GE: AUTHOR [+2]

Abstract

This bubble domain splitter uses a herringbone permalloy pattern on a bubble sustaining medium as an orthoferrite. Magnetic fields X and Y direction are used to drive the bubble domains. Fig. A shows the permalloy pattern, while Fig. B shows the magnetic components Hx and Hy together with the phase sequence of applied magnetic field H. The actual splitting of a bubble BD during magnetic field phase sequence 1-4 is shown in Figs. C1-C4.

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Bubble Domain Splitter Using Herringbone Permalloy Pattern

This bubble domain splitter uses a herringbone permalloy pattern on a bubble sustaining medium as an orthoferrite. Magnetic fields X and Y direction are used to drive the bubble domains. Fig. A shows the permalloy pattern, while Fig. B shows the magnetic components Hx and Hy together with the phase sequence of applied magnetic field H. The actual splitting of a bubble BD during magnetic field phase sequence 1-4 is shown in Figs. C1-C4.

Referring to Fig. A, a bubble domain enters the splitter along the input and propagates to position 1. Bubble domain BD in position 1 is ready to be split into two parts, one of which will move toward output channel 1, while the other will move to output channel 2.

Referring to the phase sequence shown in Figs. C1-C4, the position of bubble domain BD in phase 1 is shown in C1. During phase 2, bars a and b are magnetized to stretch bubble domain BD (Fig. C2).

Subsequently, the three horizontal bars c, d, and e are magnetized to further expand bubble domain BD to a serpentine state, as shown in Fig. C3. In phase 4, permalloy bars f, g, and h are magnetized. Magnetization of bar h ruptures the serpentine domain into two parts, and magnetization of bars f and g attracts the newly formed bubble parts BD1 and BD2 into output channel 1 and output channel 2, respectively.

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