Computer simulation of the operation of a magnetic bubble domain propagation circuit modeled after a current-access device

The operation of a bubble-domain straight-line propagation circuit has been simulated successfully. This simulation has been achieved by our approximating the motion of an s = 0 frozen-azimuth bubble placed under a drive field
H_{Z}(X, Y, T)= -H_{p} \cdot \cos [2\pi(X/R_{X} - n(T)/4)] \cdot \exp [-(Y/R_{Y})^{2}]
. The simulation has been generated from a previously developed numerical scheme to simulate the motion of a bubble, whose domain shape and magnetization structure along its domain wall were variable. The drive field has been modeled after a dual conductor-sheet, current-access propagation structure, which has a bit period R
X
and a transverse width on the order of
2R_{Y}
. The entire field contour has been advanced stepwise in the positive
X
direction by an increase of the integer
n(T)
, which represents the drive-phase number. The bubble motion has been observed during the first six drive phases to produce operating margin diagrams for drive frequencies of 250 KHz, 796 KHz and 1 MHz. The method of calculation and the results of the simulation are given.