| Issue |
Europhys. Lett.
Volume 65, Number 4, February 2004
|
|
|---|---|---|
| Page(s) | 546 - 552 | |
| Section | Condensed matter: electronic structure, electrical, magnetic, and optical properties | |
| DOI | https://doi.org/10.1209/epl/i2003-10121-4 | |
| Published online | 01 February 2004 | |
Influence of the stray field of a magnetic dot on the nucleation of superconductivity in a disk
Nanoscale Superconductivity and Magnetism Group Laboratory for Solid State Physics and Magnetism, K. U. Leuven Celestijnenlaan 200 D, B-3001 Leuven, Belgium
Received:
17
September
2003
Accepted:
10
December
2003
We have investigated the nucleation of superconductivity in an
mesoscopic disk, with a magnetic dot on the top. The dot
is magnetized perpendicularly, and its magnetic field is
inhomogeneous. The disk and magnetic dot are separated
by an insulating layer, which ensures that there is only magnetic
interaction between them. This hybrid superconductor/ferromagnet
structure exhibits the maximum critical temperature for a finite
value of the perpendicular applied magnetic field, which is
parallel to the magnetization of magnetic dot. We have found a
good agreement between the experimental data for the
superconductor/normal metal phase boundary and the theoretical
predictions based on the Ginzburg-Landau theory.
PACS: 74.78.Na – Mesoscopic and nanoscale systems / 74.25.Dw – Superconductivity phase diagrams
© EDP Sciences, 2004
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