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Probing atomic structure in magnetic core/shell nanoparticles using synchrotron radiation

By S.H. Baker, Mervyn Roy, S.C. Thornton, M. Qureshi and C. Binns

Abstract

Full text of this item is not currently available on the LRA. \ud The final published version is available at http://iopscience.iop.org/0953-8984/22/38/385301/, Doi: 10.1088/0953-8984/22/38/385301.Core/shell Fe/Cu and Fe/Au nanoparticles were prepared directly by deposition from the gas phase. A detailed study of the atomic structure in both the cores and shells of the nanoparticles was undertaken by means of extended absorption fine structure (EXAFS) measurements. For Fe/Cu nanoparticles, a Cu shell ~ 20 monolayers thick appears similar in structure to bulk Cu and is sufficient to cause the structure in the Fe core to switch from body centred cubic (bcc; as in bulk Fe) to face centred cubic. This is not the case for thinner Cu shells, 1–2 monolayers in thickness, in which there is a considerable contraction in nearest-neighbour interatomic distance as the shell structure changes to bcc. In Fe/Au nanoparticles, the crystal structure in the Fe core remains bcc for all Au thicknesses although there is some stretching of the lattice. In thin Au shells ~ 2 monolayers thick, there is strong contraction in interatomic distances. There does not appear to be significant alloying at the Fe/Au interface

Publisher: Institute of Physics
Year: 2010
DOI identifier: 10.1088/0953-8984
OAI identifier: oai:lra.le.ac.uk:2381/8455
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