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04 October 2022
  » arxiv » cond-mat/0310132

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Phase diagram of a superconductor / ferromagnet bilayer
M. Lange ; M. J. Van Bael ; V. V. Moshchalkov ;
Date 7 Oct 2003
Journal Phys. Rev. B 68, 174522 (2003)
Subject Superconductivity | cond-mat.supr-con
AbstractThe 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.
Source arXiv, cond-mat/0310132
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