Time-Reversed Antiferromagnetic States in Dysprosium Aluminum Garnet

The field dependences of the magneto-optical rotation of the two time-reversed states of antiferromagnetic dysprosium aluminum garnet show significant differences. These are interpreted in terms of the spatial variation in the signs of the spin-spin interactions demanded by the crystal symmetry. The coexistence of the two time-reversed states has been studied by microscopy made possible by the rotation difference and also by a striking "decoration" of the domain walls by paramagnetic nuclei.

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