Simulations of Ising models This is a copy of a Superb Ising model site from TU Delft. The Ising model The Ising model is a simple model to study phase transitions. So-called spins sit on the sites of a lattice; a spin S can take the value +1 or -1. These values could stand for the presence or absence of an atom, or the orientation of a magnetic atom (up or down). The energy of the model derives f