Abstract
The magnetic response of type-II superconductors can be irreversible due to two different reasons: vortex pinning and barriers for flux penetration. Even without bulk pinning and in the absence of a microscopic Bean–Lingston surface barrier for vortex penetration, superconductors of non-ellipsoidal shape can exhibit a large geometric barrier for flux penetration. This edge barrier and the resulting irreversible magnetization loops and flux-density profiles are computed from continuum electrodynamics for superconductor strips and disks with constant thickness, both with and without bulk pinning. Expressions for the field of first flux entry H en and for the reversibility field H rev above which the pin-free magnetization becomes reversible, are given. Both fields are proportional to the lower critical field H c1 and depend only on the specimen shape. These realistic results are compared with the reversible magnetic behavior of ideal superconductor ellipsoids.
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