Abstract
The M(T) and M(H) curves were measured to study the spin-ordered state in MnF3 at low temperatures. In order to obtain the temperature dependence of magnetization, Mn3+ NMR resonance frequency was measured as a function of temperature. The resulting curve fits well to the initial temperature dependence of the magnetization expected for antiferromagnets with magnetic anisotropy, T3/2exp(−EG/kBT), with an energy gap EG of about 30K. From the comparison of the M(H) curve and classical theory, the relation between the anisotropy energy, Ka, and the exchange coupling constant between the nearest neighbors, J1, was found to be Ka∼−1.8J1+9.8 in the absolute temperature unit.
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