Magnetic properties of sol-gel-derived doped ZnO as a potential ferromagnetic semiconductor: A synchrotron-based study

N. R.S. Farley, K. W. Edmonds, A. A. Freeman, G. Van Der Laan, C. R. Staddon, D. H. Gregory, B. L. Gallagher

Research output: Contribution to journalArticlepeer-review

19 Citations (Scopus)

Abstract

A variety of x-ray techniques is employed to investigate sol-gel-synthesized Co- and Mn-doped ZnO films. X-ray diffraction (XRD) shows that the dominant structure is the c-axis orientated wurtzite ZnO. Dopant K-edge extended x-ray absorption fine structure (EXAFS) and x-ray absorption near edge structure (XANES) indicate that the Co and Mn ions are fourfold co-ordinated with valency 2+/3+ and 3+/4+, respectively. Surface-sensitive dopant L-edge XANES and x-ray magnetic circular dichroism (XMCD) for the Co dopant are well described by atomic multiplet calculations for tetrahedral Co2+, while for Mn the data indicate that the symmetry is lowered due to Jahn-Teller distortion. The XMCD show conclusively that both Co- and Mn-doped ZnO films are purely paramagnetic.

Original languageEnglish
Article number055012
JournalNew Journal of Physics
Volume10
DOIs
Publication statusPublished - May 23 2008

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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