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Magnetic properties of sol-gel-derived doped ZnO as a potential ferromagnetic semiconductor: a synchrotron-based study
DOI:
10.1088/1367-2630/10/5/055012
Authors:
N. R. S.
Farley
(University of Nottingham; Daresbury Laboratory)
,
C. R.
Staddon
(University of Nottingham)
,
D. H.
Gregory
(University of Nottingham)
,
B. L.
Gallagher
(University of Nottingham)
,
A. A.
Freeman
(University of Nottingham)
,
G.
Van Der Laan
(Daresbury Laboratory; Diamond Light Source)
,
K. W.
Edmonds
(University of Nottingham)
Co-authored by industrial partner:
No
Type:
Journal Paper
Journal:
New Journal Of Physics
, VOL 10
, PAGES 055012-1/11
State:
Published (Approved)
Published:
May 2008
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.
Diamond Keywords: Ferromagnetism
Subject Areas:
Physics,
Materials
Facility: ID08, ID26 at ESRF; 7.1, 9.3 at SRS
Added On:
19/08/2009 23:07
Documents:
Farley_2008_New_J._Phys._10_055012.pdf
Discipline Tags:
Physics
Magnetism
Materials Science
Technical Tags: