Calculations of remanent magnetization for hard superconductors in various critical-state models
Ming Xu
DOI 10.1103/PhysRevB.44.2713 · Physical Review B
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Abstract
Detailed calculations of remanent magnetization for hard superconductors are carried out, based on various critical-state relations. There are three different field stages distinguished by two characteristic penetration fields, H1* and H2*. Remanent magnetization in each stage has a different field dependence which initially increases smoothly with increasing field, then is sharply enhanced with the field, and finally crosses over to a saturation value. The calculated remanant magnetizations are in good agreement with experimental data for both conventional and high-Tc superconductors. Also discussed are the flux-pinning picture, the scaling behavior of the remanent magnetization, and the physical meaning of the penetration fields.
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