Controllable state conversions for S=1 bubble domains

Details Controllable state conversions for S=1 bubble domains Controllable state conversions for S=1 bubble domains

1976-06-17

1978-01-10

Moffitt, James W.

Static information storage and retrieval

Magnetic bubbles

In-plane field

365 7, G11C 1114

Patent

active

040682200

ABSTRACT:
A technique for controllably providing state conversions between bubble domains having a common winding number S is described. In particular, controlled conversions between bubble domains having winding number S=1 is achieved by the application of spatially invariant, homogeneous magnetic fields. For the conversion of .sigma. bubbles (having two vertical Bloch lines) to .chi. bubbles (having no vertical Bloch lines), an in-plane field is not required and only a time varying perpendicular z-field is used. For conversion of a .chi..sub.+ bubble to a .chi..sub.- bubble, and vice versa, a time varying field pulse is applied, there being no requirement for an in-plane magnetic field. However, for the conversion of .chi. bubbles to .sigma. bubbles, an in-plane field is used simultaneously with a time varying z-field. For all controlled conversions, the applied magnetic fields do not have spatial gradients. The magnitudes of the applied magnetic fields and the rise and fall times of the z field are controlled within certain ranges in order to have controlled conversion of one state to another.

REFERENCES:
patent: 3930243 (1975-12-01), Hsu et al.
IBM Technical Disclosure Bulletin - vol. 17, No. 11, Apr. 1975, p. 3461.
Journal of Magnetism and Magnetic Materials - vol. 2, No. 4, 1976, pp. 357-360.

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