Abstract
The mechanism of hysteresis of magnetization in superparamagnetic systems under a time-increasing (decreasing) magnetic field is studied. The model used involves the nonequilibrium thermodynamic properties of superparamagnetic systems, such as the difference in temperature between the spin subsystem and the lattice caused by a sweeping magnetic field. It is shown that the temperature of the spin system and, hence, the magnitude of the magnetization always lag behind a variable magnetic field, which might be the cause of the observed hystertesis of magnetization. The results of calculations are compared with the experimental data for V15 nanoclusters.
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