Anisotropy energy initial relative

To answer these questions, it is necessary to know if the properties are measured at the thermodynamic equilibrium. Let us consider two unequal minima for the anisotropy energy. This leads to two relaxation times, relative to the passage from the lowest minimum Af to the upper minimum M and t relative to the reverse passage (see Section D). We can say that the thermodynamic equilibrium is reached if the populations of and M, which depend on the initial conditions, are proportional to and T, respectively. If the two minima are equivalent, t = r and the populations have to be equal. Of course, the equilibrium is always reached when there remains only one minimum due to the effect of an applied held. 

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