Title: Scanning Hall probe microscopy observation of flux pinning in a Pb film covering an array of Co dots
Authors: Bekaert, Joost
Van Bael, Margriet
Temst, Kristiaan
Van Look, Lieve
Moshchalkov, Victor
Bruynseraede, Yvan
Howells, GD
Grigorenko, AN
Bending, SJ
Borghs, Gustaaf #
Issue Date: Aug-2000
Publisher: John wiley & sons ltd
Series Title: Surface and Interface Analysis vol:30 issue:1 pages:444-447
Abstract: High-resolution scanning Hall probe microscopy (SHPM) has been used to investigate the superconducting properties of a thin ph film covering a square array of rectangular submicron Co dots, After magnetization, all the dots are shown to be in a single-domain magnetic state with dipole stray field distributions. As the sample is cooled through the critical temperature of the Pb film at B = 0 we observe strong screening of the dipole fields that we attribute to fluxoid quantization in the superconducting state, Upon cooling in applied perpendicular fields we show that the first flux line is selectively pinned at the pole of the magnet with the opposite sign of stray field. Ordered vortex structures, which are commensurate with the underlying pinning array, are observed at fields up to twice the matching field. At fields in excess of the first matching held, each pinning site appears to be capable of trapping at least two flux lines and no evidence is seen for interstitial vortices up to twice the matching field at temperatures well below the critical temperature of the covering Ph film. Copyright (C) 2000 John Wiley & Sons, Ltd.
ISSN: 0142-2421
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Solid State Physics and Magnetism Section
Physics and Astronomy - miscellaneous
Nuclear and Radiation Physics Section
# (joint) last author

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