Adjacent Cell Interaction and MRAM Error Rate Prediction

Effects of weak magnetostatic interaction among adjacent cells on the array quality factor (AQF) of a conventional single particle MRAM array are analyzed by the mean-field theory. Inaccuracy of the theory at modest interaction is discussed, and attributed to the emergence of stripe pattern. A numerical method is also described, for quantifying the effect of magnetostatic interaction on a write margin test. This methods allows write margins on common test patterns and on the actual data file (which is substantially random) to be compared