MAGNETIC FORCE SIGNAL OF VORTEX CREATION IN TYPE-II SUPERCONDUCTING THIN-FILMS

The possibility of the formation of a vortex in thin film due to the f ield of magnetic dipole moment when a point dipole is vertically appro aching the surface of a thin film is discussed. Calculations are perfo rmed for certain discrete values of the critical position of the point dipole for creating the vortex in the thin film and the equilibrium p ositions of the vortex, both of which depend on the strength of magnet ic dipole moment. The creation of a new single vortex in the thin film causes an abrupt change in the vertical force. (C) 1997 Elsevier Scie nce B.V.