Nonlinear dynamics of the Four-sublattice antiferromagnet La2CuO4

The dynamics of domain walls in four-sublattice antiferromagnets of the La2CuO4 type in an external magnetic field is studied. It is shown that an oscillating field in the amplitude-linear approximation excites vibrations of acoustic-type boundaries, while drift of such boundaries takes place in second order perturbation theory. The drift velocity is calculated, and its dependence on the frequency and polarization of the field is analyzed.

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