On motion of cylindrical magnetic domains along a $T -- I$ pattern

For every period of the structure which controls the motion of cylindrical magnetic domains (bubbles) along a of $T -- I$ permalloy pattern four delay positions have been found. Thus far no explanation has been forthcoming for the essential difference between the delay positions found by different mathematical modeling techniques and those found by the opto-electric method and high speed photography. The differences are explained by the specifics in remagnetization of narrow permalloy $T$ and $I$-patterns that were overlooked in those models. These specifics are instrumental in explaining the bubble motion along the $T -- I$ pattern; the delay positions found in this approach match the experimental findings.