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Title: Magnetite nano-islands on silicon-carbide with graphene

Abstract

X-ray magnetic circular dichroism (XMCD) measurements of iron nano-islands grown on graphene and covered with a Au film for passivation reveal that the oxidation through defects in the Au film spontaneously leads to the formation of magnetite nano-particles (i.e., Fe3O4). The Fe nano-islands (20 and 75 monolayers; MLs) are grown on epitaxial graphene formed by thermally annealing 6H-SiC(0001) and subsequently covered, in the growth chamber, with nominal 20 layers of Au. Our X-ray absorption spectroscopy and XMCD measurements at applied magnetic fields show that the thin film (20 ML) is totally converted to magnetite, whereas the thicker film (75 ML) exhibits properties of magnetite but also those of pure metallic iron. Temperature dependence of the XMCD signal (of both samples) shows a clear transition at T V ≈120 TV≈120 K consistent with the Verwey transition of bulk magnetite. These results have implications on the synthesis of magnetite nano-crystals and also on their regular arrangements on functional substrates such as graphene.

Authors:
 [1];  [1];  [1];  [2];  [1];  [1]
  1. Ames Laboratory and Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011, USA
  2. X-ray Science Division, Advanced Photon Source, Argonne National Laboratory, Lemont, Illinois 60439, USA
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1473597
DOE Contract Number:  
AC02-06CH11357
Resource Type:
Journal Article
Journal Name:
Journal of Applied Physics
Additional Journal Information:
Journal Volume: 121; Journal Issue: 1; Journal ID: ISSN 0021-8979
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English

Citation Formats

Anderson, Nathaniel A., Zhang, Qiang, Hupalo, Myron, Rosenberg, Richard A., Tringides, Michael C., and Vaknin, David. Magnetite nano-islands on silicon-carbide with graphene. United States: N. p., 2017. Web. doi:10.1063/1.4973571.
Anderson, Nathaniel A., Zhang, Qiang, Hupalo, Myron, Rosenberg, Richard A., Tringides, Michael C., & Vaknin, David. Magnetite nano-islands on silicon-carbide with graphene. United States. doi:10.1063/1.4973571.
Anderson, Nathaniel A., Zhang, Qiang, Hupalo, Myron, Rosenberg, Richard A., Tringides, Michael C., and Vaknin, David. Sat . "Magnetite nano-islands on silicon-carbide with graphene". United States. doi:10.1063/1.4973571.
@article{osti_1473597,
title = {Magnetite nano-islands on silicon-carbide with graphene},
author = {Anderson, Nathaniel A. and Zhang, Qiang and Hupalo, Myron and Rosenberg, Richard A. and Tringides, Michael C. and Vaknin, David},
abstractNote = {X-ray magnetic circular dichroism (XMCD) measurements of iron nano-islands grown on graphene and covered with a Au film for passivation reveal that the oxidation through defects in the Au film spontaneously leads to the formation of magnetite nano-particles (i.e., Fe3O4). The Fe nano-islands (20 and 75 monolayers; MLs) are grown on epitaxial graphene formed by thermally annealing 6H-SiC(0001) and subsequently covered, in the growth chamber, with nominal 20 layers of Au. Our X-ray absorption spectroscopy and XMCD measurements at applied magnetic fields show that the thin film (20 ML) is totally converted to magnetite, whereas the thicker film (75 ML) exhibits properties of magnetite but also those of pure metallic iron. Temperature dependence of the XMCD signal (of both samples) shows a clear transition at T V ≈120 TV≈120 K consistent with the Verwey transition of bulk magnetite. These results have implications on the synthesis of magnetite nano-crystals and also on their regular arrangements on functional substrates such as graphene.},
doi = {10.1063/1.4973571},
journal = {Journal of Applied Physics},
issn = {0021-8979},
number = 1,
volume = 121,
place = {United States},
year = {2017},
month = {1}
}

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