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Abstract
In magnetic thin films, the nonlinear Schroedinger (NLS) equation predicts the formation of a pair of dark solitons with equal and opposite phase shifts from an input pulse without phase modulation. To consider the effects of higher input power, a modified NLS equation is derived including higher order dispersive and nonlinear terms. An analytic solution to the modified equation is obtained which has the form of a single dark soliton in agreement with recent experiments using higher input power.
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