Abstract
The influence of inhomogeneity of a magnetic fringe field on the coherent spin dynamics of localized manganese impurities in a diluted magnetic semiconductor quantum well is studied by time-resolved Kerr rotation. It is shown that the spatially varying fringe field leads to a temporally varying ensemble precession frequency and a reduced ensemble spin dephasing time ${T}_{2}^{*}$, which can be modeled by taking into account the local fringe field distribution.
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