Magnetic anisotropy in quantum hall ferromagnets

T. Jungwirth, S. P. Shukla, L. Smrčka, M. Shayegan, A. H. MacDonald

Research output: Contribution to journalArticle

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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 languageEnglish (US)
Pages (from-to)2328-2331
Number of pages4
JournalPhysical review letters
Volume81
Issue number11
DOIs
StatePublished - Sep 14 1998

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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    Jungwirth, T., Shukla, S. P., Smrčka, L., Shayegan, M., & MacDonald, A. H. (1998). Magnetic anisotropy in quantum hall ferromagnets. Physical review letters, 81(11), 2328-2331. https://doi.org/10.1103/PhysRevLett.81.2328