[11a-S423-1~8] 11.1 Fundamental properties

△ [11a-S423-3] Observation of driven vortices in NbN film by magneto-optical imaging

〇Hodaka Kurokawa¹, Yuto Kinoshita², Fuyuki Nabeshima¹, Masashi Tokunaga², Atsutaka Maeda¹ (1.U. Tokyo, 2.ISSP, U. Tokyo)

Keywords:superconductor, vortex, magneto optical imaging

Dynamics of driven vortices in a superconductor is intensively investigated because of its importance in the operation of superconducting magnets. Direct observation of the flow should be a strong tool to understand its nonequilibrium dynamics. However, there are few reports about a real-space and real-time imaging of current driven vortices. We observed the response of vortices in a NbN film to pulsed currents with magneto-optical microscopy for the first time.