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Title: Magnetic interaction reversal in watermelon nanostructured Cr-doped Fe nanoclusters

Cr-doped core-shell Fe/Fe-oxide nanoclusters (NCs) were synthesized at varied atomic percentages of Cr from 0 at. % to 8 at. %. The low concentrations of Cr (<10 at. %) were selected in order to inhibit the complete conversion of the Fe-oxide shell to Cr{sub 2}O{sub 3} and the Fe core to FeCr alloy. The magnetic interaction in Fe/Fe-oxide NCs (∼25 nm) can be controlled by antiferromagnetic Cr-dopant. We report the origin of σ-FeCr phase at very low Cr concentration (2 at. %) unlike in previous studies, and the interaction reversal from dipolar to exchange interaction in watermelon-like Cr-doped core-shell NCs.
Authors:
;  [1] ; ;  [2] ; ;  [3] ;  [4] ;  [5]
  1. Department of Physics, University of Idaho, Moscow, Idaho 83844 (United States)
  2. Department of Physics and Astronomy, University of Wyoming, Laramie, Wyoming 82071 (United States)
  3. Environmental Molecular Sciences Laboratory, Pacific Northwest National Laboratory, Richland, Washington 99352 (United States)
  4. Department of Materials Science and Engineering, Boise State University, Boise, Idaho 83725 (United States)
  5. (United States)
Publication Date:
OSTI Identifier:
22254085
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 103; Journal Issue: 20; Other Information: (c) 2013 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
77 NANOSCIENCE AND NANOTECHNOLOGY; ALLOYS; ANTIFERROMAGNETISM; CHROMIUM OXIDES; DOPED MATERIALS; EXCHANGE INTERACTIONS; NANOSTRUCTURES