Flux trapping in a superconducting thin film as revealed by simulations and scanning superconducting quantum interference device microscope observations

Tanaka, Keiichi; Morooka, Toshimitsu; Odawara, Akikazu; Chinone, Kazuo; Mawatari, Yasunori; Koyanagi, Masao
September 2000
Applied Physics Letters;9/11/2000, Vol. 77 Issue 11
Academic Journal
Penetration of magnetic fluxes into a superconducting thin film that contained holes was studied for fast and slow cooling rates (0.18 and 0.009 K/s, respectively) under an ambient magnetic field of about 3 μT. By using a scanning superconducting quantum interference device microscope, we observed trapped magnetic fluxes both inside and outside of holes prepared in a superconducting film. The trapped fluxes outside the holes appeared in a regular arrangement when the superconducting film was cooled at the slow rate. Observed arrangements of the trapped fluxes were compared with a simulation that was based on a theoretical model that considered the surface barrier and the interaction among fluxes. The simulation explained well the observed arrangements of magnetic fluxes. © 2000 American Institute of Physics.


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