  We have defined pinning fields as those random fields that keep some of the
magnetic moments unreversed in the region of negative external applied field
during the demagnetizing process. An analysis of the statistical properties of
such pinning fields is presented within the context of the Gaussian Random
Field Ising Model (RFIM). We show that the average of the pinning fields
exhibits a drastic increase close to the coercive field and that such an
increase is discontinuous for low degrees of disorder. This behaviour can be
described with standard finite size scaling (FSS) assumptions. Furthermore, we
also show that the pinning fields corresponding to states close to coercivity
exhibit strong statistical correlations.
