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Acoustic Generation Of Bubble Domains

IP.com Disclosure Number: IPCOM000078115D
Original Publication Date: 1972-Nov-01
Included in the Prior Art Database: 2005-Feb-25
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

Chaudhari, P: AUTHOR [+2]

Abstract

Presently, control generation of bubble domain devices, uses a rotating magnetic field in the plane of the magnetic sheet containing the domains. This rotating field is also used to propagate the domains. The bubble domain generation is relatively uncontrolled or requires an in-plane rotating field.

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Acoustic Generation Of Bubble Domains

Presently, control generation of bubble domain devices, uses a rotating magnetic field in the plane of the magnetic sheet containing the domains. This rotating field is also used to propagate the domains. The bubble domain generation is relatively uncontrolled or requires an in-plane rotating field.

To overcome these difficulties, it is proposed to perturb the equilibrium shape of the domain by applying a strain which influences the magnetic anisotropy of the material. The equilibrium shape of a domain is determined by a balance between the wall energy of the domain, its magnetostatic energy, and the external magnetic field -- bubble interaction energy. The presence of a suitable strain causes a domain to collapse locally into a stripe domain. The ends of this stripe domain are then pinned to magnetic overlay patterns. On removal of the superimposed strain wave, the domains attempt to form a bubble domain. However, due to the pinning at the end points, the domain breaks up into two bubble domains.

One of the new domains is propagated by the overlay pattern, and the other is used to form another stripe domain for the next cycle of operation. The strain is readily applied by a surface acoustic wave and bubble domain generation in the megacycle range can be readily obtained.

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