Phase diagram of a superconductor / ferromagnet bilayer

Details Phase diagram of a superconductor / ferromagnet bilayer Phase diagram of a superconductor / ferromagnet bilayer

2003-10-07

arxiv.org/abs/cond-mat/0310132v2

Phys. Rev. B 68, 174522 (2003)

Physics

Condensed Matter

Superconductivity

6 pages, 7 figures

Scientific paper

10.1103/PhysRevB.68.174522

The magnetic field (H) - temperature (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 band-like 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~H^2 for low H and Tc~H for higher fields, indicating a dimensional crossover from a one-dimensional network-like to a two-dimensional behavior in the nucleation of superconductivity.

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