Abstract
Room-temperature ferromagnetism was observed in Ge nanostructures deposited on polystyrene nanospheres. Various Ge layers (3, 5, 10, and 20nm) were deposited on different nanospheres (20, 30, 50, and 100nm in diameter). The magnetization in Ge nanostructures was influenced by both the thickness of Ge layers and the size of nanospheres. Maximum magnetization (360emu∕g) and magnetic moment (4.7μB∕Ge) were observed in the sample with a 5nm thick Ge layer on nanospheres with a diameter of 20nm. The ferromagnetism in Ge nanostructures was attributed to both the quantum size effect and the junctions among nanostructures.
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