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

Farley, N.R.S., Edmonds, K.W., Freeman, A.A., van der Laan, G., Staddon, C.R., Gregory, D.H. and Gallagher, B.L. (2008) Magnetic properties of sol-gel-derived doped ZnO as a potential ferromagnetic semiconductor: a synchrotron-based study. New Journal of Physics, 10(5), 055012. (doi: 10.1088/1367-2630/10/5/055012)

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.

• Item Type: Articles
• Status: Published
• Refereed: Yes
• Glasgow Author(s) Enlighten ID: Gregory, Professor Duncan
• Authors: Farley, N.R.S., Edmonds, K.W., Freeman, A.A., van der Laan, G., Staddon, C.R., Gregory, D.H., and Gallagher, B.L.
• College/School: College of Science and Engineering > School of Chemistry
• Journal Name: New Journal of Physics
• Publisher: Institute of Physics Publishing Ltd.
• ISSN: 1367-2630
• ISSN (Online): 1367-2630