Abstract
Magnetization relaxation in superconductors is under the study from the very beginning of superconductivity. Now the knowledge about the nature of flux creep is suggested and confirmed by many experiments, but mainly by macromeasurement of average magnetization. Studying the relaxation in finite size superconductors, melt textured and single crystals YBCO, we have found the relaxation is determined not only by material properties, pinning center sizes, dimensionality and distribution, but sample size and shape as well as magnetic flux distribution. Magneto-optic technique, used to visualize the spatial magnetic flux distribution and redistribution in superconductors during relaxation, allowed us to understand the origin of these effects.
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