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Sense Detection for Bloch Domain Walls

IP.com Disclosure Number: IPCOM000083645D
Original Publication Date: 1975-Jun-01
Included in the Prior Art Database: 2005-Mar-01
Document File: 2 page(s) / 50K

Publishing Venue

IBM

Related People

Argyle, BE: AUTHOR [+2]

Abstract

Magnetic bubble domains having pure right-handed or left-handed chirality are sensed using the magnetic field of an AC current, which passes perpendicularly through the magnetic material in which the domains exist. Depending upon the chirality of the domains, they will oscillate out-of-phase with one another to enable detection.

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Sense Detection for Bloch Domain Walls

Magnetic bubble domains having pure right-handed or left-handed chirality are sensed using the magnetic field of an AC current, which passes perpendicularly through the magnetic material in which the domains exist. Depending upon the chirality of the domains, they will oscillate out-of-phase with one another to enable detection.

Fig. 1 shows two bubble domains, one with pure right-handed chirality and the other with pure left-handed chirality. That is, the wall magnetization of the domains is in the same direction around the entire domain wall periphery for both domains, the only difference being the sense of the chirality direction.

For detection of the domains of Fig. 1, a circular magnetic field is used to oscillate the domains. This circular magnetic field exists in the plane of the magnetic medium in which the domains exist, and is provided by a current through the bubble domain material. In the case of an amorphous bubble domain material comprised of a metallic film, a conduction current is used, while in the case of an electrically insulating bubble domain film (such as a garnet), a capacitive current or displacement current is utilized.

The circular AC field H(ac) will be either parallel or antiparallel to the wall magnetization of the domains. The bubble domains will expand when H(ac) is parallel to the wall magnetization and will contract when H(ac) is antiparallel to the wall magnetization. Thus, the phase of the...