CONTROLLABLE STATE CONVERSIONS FOR S=1 BUBBLE DOMAINS

• Main Authors: SLONCZEWSKI, JOHN C, DEKKER, PIETER, ARGYLE, BERNELL E
• Format: Patent
• Language: English; French
• Published: 24.03.1981
• Subjects: INFORMATION STORAGE; PHYSICS; STATIC STORES

CONTROLLABLE STATE CONVERSIONS FOR S=1 BUBBLE DOMAINS 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 X 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 X+ bubble to a Xbubble, 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 X 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.