Phys. Rev. Lett. 81, 2328–2331 (1998)

Magnetic Anisotropy in Quantum Hall Ferromagnets

Abstract

References

Citing Articles (38)

Download: PDF (223 kB) Buy this article Export: BibTeX or EndNote (RIS)

T. Jungwirth^1,2, S. P. Shukla³, L. Smrčka², M. Shayegan³, and A. H. MacDonald¹
¹Department of Physics, Indiana University, Bloomington, Indiana 47405
²Institute of Physics ASCR, Cukrovarnická 10, 162 00 Praha 6, Czech Republic
³Department of Electrical Engineering, Princeton University, Princeton, New Jersey 08544

Received 19 May 1998; published in the issue dated 14 September 1998

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.

URL:

http://link.aps.org/doi/10.1103/PhysRevLett.81.2328

DOI:

10.1103/PhysRevLett.81.2328

PACS:

73.40.Hm, 75.10.Lp, 75.30.Gw

About | Terms and Conditions | Subscriptions | Search | Help

Use of the American Physical Society websites and journals implies that the user has read and agrees to our Terms and Conditions and any applicable Subscription Agreement. Physical Review®, Physical Review Letters®, Reviews of Modern Physics®, and Physical Review Special Topics® are trademarks of the American Physical Society.

Citation Search:

Phys. Rev. Lett. 81, 2328–2331 (1998)

Magnetic Anisotropy in Quantum Hall Ferromagnets