ELNES as a probe of magnetic order in mixed oxides

Eustace, D.A., Docherty, F.T. , McComb, D.W. and Craven, A.J. (2006) ELNES as a probe of magnetic order in mixed oxides. Journal of Physics: Conference Series, 26(1), pp. 165-168. (doi: 10.1088/1742-6596/26/1/039)

Abstract

A previous study of chromite and ferrite spinels revealed energy-loss near-edge structure (ELNES) in the oxygen K-edge that could not be reproduced in non-spin polarised calculations. Chromite and ferrite spinels typically undergo transitions to long range ordered magnetic structures at temperatures below ~15K. A model in which dynamic magnetic short range order (SRO) persists above the Néel temperature until 100K has been proposed using neutron powder diffraction. In the TEM, the interaction time of the fast electron with the specimen is sufficiently short for dynamic magnetic interactions to influence the observed ELNES at 300K. Here we present new spin polarised calculations performed using the commercially available codes FEFF8.2 and Wien97. The calculated oxygen K-edge ELNES show improved agreement with experiment when magnetic interactions are included in the calculation.

• Item Type: Articles
• Additional Information: EMAG–NANO 2005:Imaging, Analysis and Fabrication on the Nanoscale 31 August–2 September 2005, University of Leeds, UK
• Status: Published
• Refereed: Yes
• Glasgow Author(s) Enlighten ID: McComb, Dr David and Docherty, Dr Frances and Craven, Professor Alan
• Authors: Eustace, D.A., Docherty, F.T., McComb, D.W., and Craven, A.J.
• College/School: College of Science and Engineering > School of Chemistry; College of Science and Engineering > School of Physics and Astronomy
• Journal Name: Journal of Physics: Conference Series
• Publisher: Institute of Physics Publishing Ltd.
• ISSN: 1742-6588
• ISSN (Online): 1742-6596