Phase diagram of a superconductor/ferromagnet bilayer
M. Lange, M. J. Van Bael, V. V. Moshchalkov
DOI 10.1103/PhysRevB.68.174522 · Physical Review B
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Abstract
The magnetic-field–temperature (H−T) phase diagram of a superconductor is significantly altered when domains are present in an underlying ferromagnet with perpendicular magnetic anisotropy. When the domains have a bandlike shape, the critical temperature Tc of the superconductor in zero field is strongly reduced and the slope of the upper critical field as a function of T is increased by a factor of 2.4 due to the inhomogeneous stray fields of the domains. Field compensation effects can cause an asymmetric phase boundary with respect to H when the ferromagnet contains bubble domains. For a very inhomogeneous domain structure, Tc∝H2 for low H and Tc∝H for higher fields, indicating a dimensional crossover from a one-dimensional networklike to a two-dimensional behavior in the nucleation of superconductivity.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Pb Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 7.227 | Pressure not reported | onset |
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