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Magnetic Bubble Film Structure to Provide Stability of Wall States

IP.com Disclosure Number: IPCOM000085550D
Original Publication Date: 1976-Apr-01
Included in the Prior Art Database: 2005-Mar-02
Document File: 2 page(s) / 29K

Publishing Venue

IBM

Related People

Calhoun, BA: AUTHOR [+2]

Abstract

A magnetic bubble film structure having improved wall state stability is described. The structure shown in the drawing has three layers of bubble material separated by two layers of nonmagnetic material.

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Magnetic Bubble Film Structure to Provide Stability of Wall States

A magnetic bubble film structure having improved wall state stability is described. The structure shown in the drawing has three layers of bubble material separated by two layers of nonmagnetic material.

The nonmagnetic layers have a thickness ranging from about 10 angstrom to the thickness of a domain wall width. The nonmagnetic layers serve to break the exchange coupling between the magnetization in the two surface layers and that in the central layer. As a result, Bloch lines or points which are generated in the surface layers cannot penetrate the nonmagnetic layers to alter the wall structure in the central layer.

The distance, t, of the nonmagnetic layers from the surface should be such that the wall magnetization in the surface layers would be twisted into a Neel-like configuration, whereas the central layer would retain a Bloch-like configuration. These conditions are satisfied when the t/h ratio (where h is the distance between the top and bottom surfaces) is about from 0.12 to 0.25.

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