The magnetization reversal dynamics of an Fe20Ni80∕Cu∕Co spin valve is investigated on the nanosecond time scale by magnetic microscopy with time and layer resolution. It is found that the speed by which micron-sized magnetic domains in the magnetically soft Fe20Ni80 layer are expanded by external field pulses exhibits a dependence on the change in domain-wall length, and on the coupling to the local magnetization direction of the Co layer.
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Kuch et al. (2004) studied this question.