Flux flow noise in high Tc superconductors thin films

We have studied the fraction pinned of vortex in a type II superconductors. The sample used is the YBa 2 Cu 3 O 7- d thin films. This fraction pinned is determined from the comparison of the experimental results and the theoretical results previously definite. In continuation one will study the variations of this fraction according to the temperature of the applied magnetic field and the electric current crossing the sample.