Enhanced Pinning of Vortices in Thin Film Superconductors by Magnetic Dot Arrays

Details Enhanced Pinning of Vortices in Thin Film Superconductors by Magnetic Dot Arrays Enhanced Pinning of Vortices in Thin Film Superconductors by Magnetic Dot Arrays

2000-03-29

arxiv.org/abs/cond-mat/0003462v1

Physics

Condensed Matter

Superconductivity

Scientific paper

We study the pinning of vortices in thin film superconductors by magnetic dots in the London approximation. A single dot is in general able to pin multiple field-induced vortices, up to a saturation number n_s, which can be much larger than one. However, the magnetic field of the dot also creates intrinsic vortices and anti-vortices, which must be accounted for. In a ferromagnetic dot array, the intrinsic anti-vortices are pinned only interstitially. Much stronger pinning effect is expected of an antiferromagnetic dot array. Possible realizations of various magnetic configurations are discussed.

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