SC vortex dynamics induced by micromagnets

Imaging the Statics and Dynamics of Superconducting Vortices and Antivortices Induced by Magnetic Microdisks.
R. B. G. Kramer, A.V. Silhanek, W. Gillijns, and V.V. Moshchalkov
Phys. Rev. X 1, 021004 (2011)

Probing the mobility of vortex-antivortex pairs. (a), (d) Scanning Hall Microscopy images at H=0 and T=6.9 K for two different magnetic moments of the disks. (b),(e) Scanning ac-susceptibility images taken with h=0.2 Oe and h=0.6 Oe, and a frequency of excitation 77 Hz. Panels (c) and (f ) show a superposition of panels (a) and (b), and (d) and (e).