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 quantum Hall effect (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.
Original language | English (US) |
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Pages (from-to) | 2328-2331 |
Number of pages | 4 |
Journal | Physical review letters |
Volume | 81 |
Issue number | 11 |
DOIs | |
State | Published - Sep 14 1998 |
All Science Journal Classification (ASJC) codes
- General Physics and Astronomy