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The effect of the spatially varying spin current on a skyrmion is numericallyinvestigated. It is shown that an inhomogeneous current density induces anelongation of the skyrmion. This elongation can be controlled using currentpulses of different strength and duration. Long current pulses lead to asplitting that forms two replicas of the initial skyrmion while for shortpulses the elongated skyrmion relaxes back to its initial circular statethrough rotation in the MHz-GHz frequency range. The frequency is dependent onthe strength of the damping coefficient.

Skyrmion elongation, duplication and rotation by spin-transfer torque under spatially varying spin current