Title: Thin-film superconductor-ferromagnet hybrids: Competition between nucleation of superconductivity at domain walls and domains' centers
Authors: Aladyshkin, AYu ×
Moshchalkov, Victor #
Issue Date: Aug-2006
Publisher: Published by the American Physical Society through the American Institute of Physics
Series Title: Physical Review B, Condensed Matter and Materials Physics vol:74 issue:6 pages:1-10
Conference: date:Katholieke Univ Leuven, INPAC, Nanoscale Superconductiv & Magnetism & Pulsed Fie, B-3001 Heverlee, Belgium; Russian Acad Sci, Inst Phys Microstruct, Nizhnii Novgorod 603950, Russia
Article number: 064503
Abstract: By using the Ginzburg-Landau theory we studied the order parameter nucleation in the planar superconductor-ferromagnet (S/F) hybrids of a finite thickness, when the magnetic field is inhomogeneous both in the lateral and transverse directions. We calculated the dependence of the critical temperature T-c on the external magnetic field H and studied the transformation of the phase transition line T-c(H), induced by the variation of the parameters of the S/F bilayers such as the period of the domain structure 2L and the thicknesses D-s and D-F of the superconducting and ferromagnetic films. The actual shape of the T-c(H) line is demonstrated to be determined by the nucleating regime at H=0. For the thin-film S/F hybrids (L/D-F > 1) a possible type of the phase boundary T-c(H) is predicted-the reentrant superconductivity with the positive slope dT(c)/d parallel to H parallel to at H=0, which appears as a consequence of the order parameter nucleation at the centers of the magnetic domains at H=0. The nucleation near the domain walls at H=0, resulting in the T-c(H) line with zero slope dT(c)/dH parallel to(H=0), can be stimulated, e.g., by increasing the D-s value or decreasing the ratio L/D-F.
ISSN: 1098-0121
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Solid State Physics and Magnetism Section
× corresponding author
# (joint) last author

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