Finite-size effects in NPs characterized by correlations

Spin-spin correlations in ferromagnetic nanosystems.
E. Y. Vedmedenko, N. Mikuszeit, T. Stapelfeldt, R. Wieser, M. Potthoff, A. I. Lichtenstein and R. Wiesendanger

European Physical Journal B,Volume 80, 331 (2011)

Model G(r) as obtained by fitting the parameters to results of MC simulations.
(a) Temperature dependence of the virtual distance r_v.
(b) Virtual correlation length ε(T).
(c) G(r) as a function of r and T. The temperatures
∞ > TC(∞) > TC(L) > Tb(L) > 0 are highlighted.