Figure 2: Monte Carlo simulations.
From: Critical exponents and scaling invariance in the absence of a critical point
(a) A family of m(T) isochamps obtained from Monte Carlo simulations for J/g=10 (kB=1 is assumed), Lx=Ly=120 and different values of the Zeeman energy b=μ·B. (b) Scaling plot m/|τ|β versus b/|τ|βδ for the data shown in a using the 2D-Ising critical exponents: collapsing is realized only when for b>bc (see the subsection ‘Technical details of Monte Carlo simulations’ in Methods). Inset: the characteristic temperature Tc, used to optimize data collapsing in the Monte Carlo scaling plots, as a function of J/g. (c) Representative snapshots of Monte Carlo configurations obtained for Lx=Ly=200, J/g=10, b/g=0.1 and T/g=10, 13, 16 (from left to right). (d) Sequence of selected SEMPA images recorded on an Fe film of 1.9 MLs deposited on Cu(001) while increasing the temperature from 315.3 to 332.2 K in a constant field B=0.61 × 10−4 T. The length of the bar is 10 μm.
