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

G - Physics

11

B

352/37.2

G11B 5/84 (2006.01) G11C 19/08 (2006.01)

Patent

CA 1098208

CONTROLLABLE STATE CONVERSIONS FOR S=1 BUBBLE DOMAINS Abstract of the Disclosure 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 invari- ant, 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 X- 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 X bubbles to .sigma. bubbles, an in-plane field is used simul- taneously 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 con- trolled conversion of one state to another.

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