Browse Prior Art Database

Bubble Domain Buster/Generator

IP.com Disclosure Number: IPCOM000076244D
Original Publication Date: 1972-Feb-01
Included in the Prior Art Database: 2005-Feb-24
Document File: 2 page(s) / 53K

Publishing Venue

IBM

Related People

Keefe, GE: AUTHOR [+2]

Abstract

This bubble generator provides bubble domains at a high-generation rate with low-current requirements. The device uses a combination of conductors and permalloy located on the magnetic chip in which bubble domains propagate. The conductors are used to decrease the bias field and the permalloy is used to concentrate the splitting magnetic field. The conductor loop can be of larger width than the bubble size, thus providing ease of fabrication.

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Bubble Domain Buster/Generator

This bubble generator provides bubble domains at a high-generation rate with low-current requirements. The device uses a combination of conductors and permalloy located on the magnetic chip in which bubble domains propagate. The conductors are used to decrease the bias field and the permalloy is used to concentrate the splitting magnetic field. The conductor loop can be of larger width than the bubble size, thus providing ease of fabrication.

The configuration is a U-shaped conductor stripline 10 deposited on magnetic chip 11. permalloy bars 12 are deposited on stripline 10. Figs. I-V show the structure and the splitting of a bubble by the device. In Figure V, an adjacent propagation loop 22 is shown to indicate how a split bubble is removed from the device.

An initial bubble 14 is nucleated at location 1 (Fig. I) and then strip line A is excited by current I(A), to attract bubble 14 from position 1 to position 2 by magnetizing permalloy bar a (Fig.
II). The bubble is then stretched into a serpentine domain 16 by exciting strip line B to magnetize permalloy bars b and c (Fig. III).

The polarity of the current pulse in stripline A is then reversed causing rupture of serpentine domain 16 into two domains 18, 20 (Fig.
IV). The two new domains immediately adopt the size of original bubble 14, due to the bias magnetic field applied normal to the plane of the orthoferrite in which the bubble domains exist. One new bubble domain 18 returns...