We study the spin configurations of the random granular nanomagnets in the
strong to intermediate pinning limit by Monte Carlo simulations. The differ
ence in spin configurations at zero and finite field is localized. A deloca
lization transition takes place at a critical field. We develop an analytic
method to understand the localization pattern of the difference in spin co
nfigurations. We also analytically calculate the finite temperature coerciv
e field and find good agreement with our Monte Carlo results.