We show that the sign of magnetic anisotropy energy in quantum Hall ferromagnets is determined by a competition between electrostatic and exchange energies. Easy-axis ferromagnets tend to occur when Landau levels whose states have similar spatial profiles cross. We report measurements of integer quantum Hall effect (QHE) evolution with magnetic-field tilt. Reentrant behavior observed for the ν0ex0ex=0ex0ex4 QHE at high tilt angles is attributed to easy-axis anisotropy. This interpretation is supported by a detailed calculation of the magnetic anisotropy energy.
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Jungwirth et al. (1998) studied this question.
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