The magnetization process in a two-sublattice system is studied by a computer simulation program, without using the assumption of the existence of a small canting angle between magnetic moments of the two sublattices. Effects of the exchange and the anisotropy on the shape of the second-derivative curves of magnetization are discussed. In the present work, a peak in the low-field range of the second-derivative curve of magnetization is reported. This peak as well as a strong effective anisotropy are found to depend on the competition between the comparatively weak exchange and the opposite anisotropies.
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