Magnetic Anisotropy in Quantum Hall Ferromagnets

Details Magnetic Anisotropy in Quantum Hall Ferromagnets Magnetic Anisotropy in Quantum Hall Ferromagnets

1998-05-19

arxiv.org/abs/cond-mat/9805240v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

12 pages, 3 figures, submitted to Phys. Rev. Lett

Scientific paper

10.1103/PhysRevLett.81.2328

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 $\nu = 4$ 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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