Magnetic aftereffect in systems of single-domain interacting particles and magnetic viscosity of rocks

Using the model of single-domain interacting particles, certain magnetic aftereffects are examined. Under the thermal-activation mechanism of magnetization approximation, dependences of viscous remanent magnetization on time, temperature, and magnetic field are obtained that agree with experimental observations. We evaluate the dependence of the time of formation of viscous magnetization on the heating temperature of a sample is carried out. Viscous magnetization, caused by diffusion in magnetic particles, is calculated. A model of viscous magnetization in a system of heterogeneous interacting particles is constructed. The coupling of the degree of chemical heterogeneity of particles and the rate of viscous magnetization is established.