Abstract
Random-field effects on 3-dimensional (3-d) and quasi 2-d weakly anisotropic Heisenberg antiferromagnets with easy-axis type anisotropy are discussed. The effective, field-dependent anisotropy model is used. This model yields an accurate and quantitative description of the effects of an applied field on the intrinsic properties of the domainwalls, i.e., the wall tension σ and the wall-thickness ds. A comparison with experimental data for K2Mn(1-x)MgxF4 (quasi 2-d) and Mn(1-x)ZnxF2 (3-d) is given. The differences with the strongly anisotropic 3-d antiferromagnetic, Fe(1-x)ZnxF2, are briefly considered. Furthermore it is argued that weakly anisotropic systems offer very promising possibilities for the study of the peculiar relaxation and metastability effects that are so characteristic for random field Ising systems.
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