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has been cited by the following article:

• TITLE: Pinning Forces in Superconductors from Periodic Ferromagnetic Dot Array

  AUTHORS: Wei Jiang Yeh, Bo Cheng, Tony Ragsdale

  KEYWORDS: Pinning Force, Periodic Ferromagnetic Dot Array, Cuprate

  JOURNAL NAME: Journal of Modern Physics, Vol.1 No.6, December 29, 2010

  ABSTRACT: Using the London equation, we derive a formula by which the pinning force from magnetic dots can be cal-culated. We numerically calculate the interaction between ferromagnetic dots and vortices in type II super-conductors under various conditions. It is found that the pinning force of the magnetic dot with 50 nm thick-ness reaches 3.5 × 10-11 N that is one order magnitude stronger than the intrinsic pinning force in cuprate at 77 K. We investigate various parameter dependences of the pinning force. It is found that the most effective way to increase the pinning force is to increase the thickness of the dot. The pinning force is weakly de-pendent on both the size and magnetic permeability of the dots. When temperature increases, the pinning force linearly decreases. And when the magnetic field increases, the attraction force increases linearly in the low field region.