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Room-temperature ferromagnetism in nanocrystalline Cu/Cu2O core-shell structures prepared by magnetron sputtering

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Author(s): Hao-Bo Li | Xinjian Xie | Weichao Wang | Yahui Cheng | Wei-Hua Wang | Luyan Li | Hui Liu | Gehui Wen | Rongkun Zheng

Journal: APL Materials
ISSN 2166-532X

Volume: 1;
Issue: 4;
Start page: 042106;
Date: 2013;
Original page

ABSTRACT
Cu/Cu2O core-shell nanoparticles with diameters around 8–9 nm have been fabricated by magnetron sputtering pure Cu targets with subsequent annealing in oxygen. Room-temperature ferromagnetism (FM) was observed in the samples annealed at 150 °C for 10–120 min. The maximum of saturated magnetization is as high as 19.8 emu/cc. The photoluminescence spectra show solid evidence that the FM originates from Cu vacancies in the Cu2O shell of the Cu/Cu2O core-shell nanoparticles. Furthermore, the FM can be modulated by the amount of Cu vacancies through the Cu/Cu2O core-shell interface engineering. Fundamentally, the FM can be understood by the charge-transfer ferromagnetism model based on Stoner theory.

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