History dependent vortex flow dynamics in mesoscopic channels

Abstract Intriguing and novel physical aspects related to the vortex flow dynamics have been recently observed in mesoscopic channel devices of a-NbGe with NbN channel edges. In this work we have studied the flow properties of such confined vortices as a function of the magnetic field history, using dc-transport and mode–locking (ML) measurements. As opposed to the field down situation, in field up case a kink anomaly in the dc I – V curves is detected. The mode–locking measurements unveil the dynamic change in the flow configurations around this anomaly: n moving rows of vortex array at low velocity changes suddenly to n  + 2 rows at high velocity around the anomaly.