Magnetic interaction reversal in watermelon nanostructured Cr-doped Fe nanoclusters

Kaur Maninder; Dai Qilin; Bowden Mark; Engelhard Mark; Wu Yaqiao; Tang Jinke; Qiang You<sup>*</sup>

doi:10.1063/1.4830434

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Magnetic interaction reversal in watermelon nanostructured Cr-doped Fe nanoclusters

作者：Kaur Maninder; Dai Qilin; Bowden Mark; Engelhard Mark; Wu Yaqiao; Tang Jinke; Qiang You^*

来源：Applied Physics Letters, 2013, 103(20): 202407.

DOI：10.1063/1.4830434

摘要

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 (%26lt;10 at. %) were selected in order to inhibit the complete conversion of the Fe-oxide shell to Cr2O3 and the Fe core to FeCr alloy. The magnetic interaction in Fe/Fe-oxide NCs (similar to 25 nm) can be controlled by antiferromagnetic Cr-dopant. We report the origin of sigma-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.