Guided nucleation of superconductivity on a graded magnetic substrate

Details Guided nucleation of superconductivity on a graded magnetic substrate Guided nucleation of superconductivity on a graded magnetic substrate

2010-05-11

arxiv.org/abs/1005.1788v1

Appl. Phys. Lett. 96, 032503 (2010)

Physics

Condensed Matter

Superconductivity

Scientific paper

We demonstrate the controlled spatial nucleation of superconductivity in a thin film deposited on periodic arrays of ferromagnetic dots with gradually increasing diameter. The perpendicular magnetization of the dots induces vortex-antivortex molecules in the sample, with the number of (anti)vortices increasing with magnet size. The resulting gradient of antivortex density between the dots predetermines local nucleation of superconductivity in the sample as a function of the applied external field and temperature. In addition, the compensation between the applied magnetic field and the antivortices results in an unprecedented enhancement of the critical temperature.

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