Computer simulation of the behavior of the system, of which free energy is known to depend on a number of parameters and also on a running parameter, is exhibited. As an example, the induced magnetization of a uniaxial antiferromagnet under varying external field is shown. It has three phases: antiferromagnetic, spin‐flopping, and ferromagnetic. Though the complexity of the expression of free energy makes it difficult to see when and how phase transition occurs, a simple device facilitates visualization of the processes.

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