Abstract
The differential magnetic susceptibility of Gd0 01Y2.99Fe5O12 polycrystalline compounds is studied at the temperature range from 0.6 to 4.2 K in pulsed magnetic fields up to 50 T. It was observed that the magnetization of the compound with x = 0.01 shows a quantum (stepwise) behavior at T = 0.6 K in magnetic fields around 33 T. The Heisenberg model of a ferrimagnet with weakly coupled antiferromagnetic impurities is used to explain the obtained results. Following this model, the energy levels of the impurity ions become not equally spaced due to the magnon-magnon interaction between the iron spins and the rare earth spins. Increase of the external field leads to the crossover of the excited states with the ground one, which takes place in different fields. In result, several peaks of the magnetic susceptibility appear under a variation of magnetic field in the vicinity of a field, which is equal to the effective field of the Gd-Fe exchange interaction.
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