Abstract
The noncompensated Fe-Sn codoped In2O3 nanodot arrays with the Sn concentration of 0.02, 0.05, 0.1, 0.15 and 0.2 were deposited on Al2O3 (0 0 0 1) substrates using laser molecular beam epitaxy with the aid of anodic aluminium oxide templates. The structural and compositional results reveal that the nanodot arrays show the single phase cubic In2O3 structure and Sn and Fe dopant ions substitute In3+ sites of the In2O3 lattice with a tetravalence (Sn4+) and a mixed-valence (Fe2+/Fe3+), respectively. All the nanodot arrays exhibit the obvious room temperature ferromagnetic behavior and the localized surface plasmon resonance (LSPR) band. Moreover, the ferromagnetism and the LSPR absorption peak can be tuned by the Sn concentration or sizes of nanodot arrays.
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