Room-temperature ferromagnetism in nanocrystalline Cu/Cu2O core-shell structures prepared by magnetron sputtering
Source abstract
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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Research context
OpenAlex topics: Copper-based nanomaterials and applications · ZnO doping and properties · Electronic and Structural Properties of Oxides
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
Nankai University 1 Department of Electronics and Tianjin Key Laboratory of Photo-Electronic Thin Film Device and Technology, , Tianjin 300071, China
Hebei University of Technology 2 School of Materials Science and Engineering, , Tianjin 300130, China
Shandong Jianzhu University 3 School of Science, , Jinan 250101, China
Jilin University 4 State Key Laboratory of Superhard Materials, , Changchun 130012, China
The University of Sydney 5 School of Physics, , NSW 2006, Australia
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