Magnetic Anisotropy in Quantum Hall Ferromagnets
T. Jungwirth, S. P. Shukla, L. Smrcka, M. Shayegan, A. H. MacDonald
Abstract
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 QHE evolution with magnetic-field tilt. Reentrant behavior observed for the ν= 4 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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