Abstract

The oxide-based diluted magnetic semiconductors (DMSs) with Curie temperatures, T c , at or above room temperature (RT) have attracted great interest due to their potential applications in spintronic devices.1 Among them, the Fe-doped In 2 O 3 DMS has attracted considerable interest because of the high solubility of Fe in the In 2 O 3 matrix, excellent electrical conductivity, and high optical trans-parency.2,3 In the past decades, many research activities have been focused on the bulk and thin films of Fe-doped In 2 O 3 . However, due to the advantages of their small size, low-dimensional characteristics and unique magnetic properties, magnetic semiconductor nanodot arrays provide a promising way to apply spin-dependent functions to semiconductor microelectronics and nanotech-nology.4 With this motivation, here we present the first study of growing Fe-doped In 2 O 3 nanodot arrays on Al 2 O 3 (0001) substrates using the pulsed laser deposition (PLD) with the aid of porous anodized aluminum (PAA) templates, and provide the insights into the origin of the RT ferromag-netism in Fe-doped In 2 O 3 nanodot arrays by a comprehensive analysis of structure, morphology and magnetic properties of the arrays.

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