Magnetic interaction reversal in watermelon nanostructured Cr-doped Fe nanoclusters

Journal Article · Mon Nov 11 00:00:00 EST 2013 · Applied Physics Letters

DOI:https://doi.org/10.1063/1.4830434· OSTI ID:22254085

Kaur, Maninder; Qiang, You ^[1]; Dai, Qilin; Tang, Jinke ^[2]; Bowden, Mark; Engelhard, Mark ^[3]; Wu, Yaqiao ^[4]

---

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)

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.

• OSTI ID: 22254085
• Journal Information: Applied Physics Letters, Vol. 103, Issue 20; Other Information: (c) 2013 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 0003-6951
• Country of Publication: United States
• Language: English

Related Subjects

77 NANOSCIENCE AND NANOTECHNOLOGY
ALLOYS
ANTIFERROMAGNETISM
CHROMIUM OXIDES
DOPED MATERIALS
EXCHANGE INTERACTIONS
NANOSTRUCTURES