Abstract
The existence of a field-induced transition between two types of domain walls is inferred from the field dependence of the rotational hysteresis, as observed in the spin-flop state of the biaxial antiferromagnet (C 2H 5NH 3) 2CuCl 4. In the spin-flop state a weak-ferromagnetic (WF) moment is present along the difficult axis; the hysteresis is connected with irreversible domain-wall movements, the leverage on the walls being provided by the WF moment in the external field.
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