Effect of nonlinear polarization of light on magnetization reversal in an antiferromagnetic Ca–Mn–Ge garnet crystal

The effect of linearly polarized light on the reversal of magnetization of the sublattices of the antiferromagnetic garnet Ca3Mn2Ge3O12 is studied in an inclined magnetic field. Magnetization was reversed by using the quadratic magnetization effect which is permitted by symmetry considerations in Ca–Mn–Ge garnet. The observed effect of light is attributed to optical transitions involving charge transfer from an Mn3+ magnetic ion to the acceptors. Polarized light makes such transitions predominant in some magnetic sublattices of the garnet, thus increasing the number of magnetic defects in them. The nonequivalence of defects in the sublattices leads to the energy nonequivalence of the time-reversed antiferromagnetic states in an irradiated crystal placed in a magnetic field, and changes the condition of antiferromagnetic magnetization reversal, i.e., stimulates or suppresses the effect.

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