Magnetic, electronic, and structural characterization of nonstoichiometric iron oxides at the nanoscale

Franz X Redl; Charles T Black; Georgia C Papaefthymiou; Robert L Sandstrom; Ming Yin; Hao Zeng; Christopher B Murray; Stephen P O'Brien

doi:10.1021/ja046808r

Magnetic, electronic, and structural characterization of nonstoichiometric iron oxides at the nanoscale

J Am Chem Soc. 2004 Nov 10;126(44):14583-99. doi: 10.1021/ja046808r.

Authors

Franz X Redl¹, Charles T Black, Georgia C Papaefthymiou, Robert L Sandstrom, Ming Yin, Hao Zeng, Christopher B Murray, Stephen P O'Brien

Affiliation

¹ T. J. Watson Research Center, Nanoscale Materials and Devices, IBM, 1101 Kitchawan Road, Route 134, P.O. Box 218, Yorktown Heights, New York 10598, USA.

PMID: 15521779
DOI: 10.1021/ja046808r

Abstract

We have investigated the structural, magnetic, and electronic properties of nonstoichiometric iron oxide nanocrystals prepared by decomposition of iron(II) and iron(0) precursors in the presence of organic solvents and capping groups. The highly uniform, crystalline, and monodisperse nanocrystals that were produced enabled a full structural and compositional survey by electron microscopy and X-ray diffraction. The complex and metastable behavior of nonstoichiometric iron oxide (wüstite) at the nanoscale was studied by a combination of Mossbauer spectroscopy and magnetic characterization. Deposition from hydrocarbon solvents with subsequent self-assembly of iron oxide nanocrystals into superlattices allowed the preparation of continuous thin films suitable for electronic transport measurements.