Title: Direct imaging of commensurate vortex structures in ordered antidot arrays
Authors: Grigorenko, AN
Howells, GD
Bending, SJ
Bekaert, Joost
Van Bael, Margriet
Van Look, Lieve
Moshchalkov, Victor
Bruynseraede, Yvan
Borghs, Gustaaf
Kaya, II
Stradling, RA #
Issue Date: Feb-2001
Publisher: American physical soc
Series Title: Physical review b vol:63 issue:5 pages:052504 1-4
Abstract: A high resolution scanning Hall probe microscope has been used to investigate flux line dynamics and pinning phenomena in a thin Pb film containing a square array of artificial pinning sites (antidots). We observe directly that a maximum of two flux quanta can be pinned at a single antidot at low temperatures (5.5 K), in reasonable agreement with theoretical predictions. Using the scanning Hall probe to measure the "local magnetization" as a function of applied field, as well as image flux line structures in the same sample, allows us to directly correlate the two data sets. Peaks in the local magnetization at rational fractional matching fields can generally be linked to ordered commensurate vortex structures that maximize the mean vortex spacing. We find the commensurate vortex structures to be very stable, but excess vortices or vacancies, formed when the applied field deviates slightly from integer filling, are mobile on the time scale of image acquisition. Data are also presented where a domain wall between two ordered commensurate domains could be clearly resolved.
ISSN: 0163-1829
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Solid State Physics and Magnetism Section
Physics and Astronomy - miscellaneous
# (joint) last author

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