Temperature-dependent orbital-moment anisotropy in dilute magnetic oxides

Jun Zhang, Ralph Skomski, Y. F. Lu, D. J. Sellmyer

Research output: Contribution to journalArticle

14 Citations (Scopus)

Abstract

A striking magnetization anisotropy in thin films of vanadium-doped stannic oxide is reported and investigated. The single-crystalline Sn1-x Vx O2 (0≤x≤0.1) thin films, grown on Al2 O3 substrate, are (101) oriented and exhibit a temperature-dependent in-plane anisotropy of the saturation magnetization. The in-plane magnetic moment reaches a maximum close to the [10 1̄] direction, but the anisotropy axis is incompatible with the crystalline structure of the Sn O2 thin films. However, it is consistent with V atoms occupying uniaxially distorted octahedral interstices, thus breaking the symmetry of the film. The moment anisotropy decreases gradually with increasing temperature and persists to temperatures above room temperature. It is modeled as a spin-orbit effect involving the hopping of orbital-current loops, as contrasted to isotropic Heisenberg exchange, and the temperature dependence of the magnetism is explained on the basis of a thermal admixture of nearly degenerate crystal-field states. The phenomena may be relevant to a wide range of dilute magnetic oxides.

Original languageEnglish (US)
Article number214417
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume75
Issue number21
DOIs
StatePublished - Jun 13 2007

Fingerprint

Oxides
Anisotropy
moments
orbitals
anisotropy
oxides
thin films
Thin films
interstices
Temperature
magnetization
temperature
Crystalline materials
admixtures
Vanadium
vanadium
crystal field theory
Magnetism
Saturation magnetization
Magnetic moments

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Cite this

Temperature-dependent orbital-moment anisotropy in dilute magnetic oxides. / Zhang, Jun; Skomski, Ralph; Lu, Y. F.; Sellmyer, D. J.

In: Physical Review B - Condensed Matter and Materials Physics, Vol. 75, No. 21, 214417, 13.06.2007.

Research output: Contribution to journalArticle

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