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• W2022035953 abstract "We have studied the electronic structure and the magnetism of Cu-doped ZnO nanowires, which have been reported to show ferromagnetism at room temperature [G. Z. Xing ${et}$ ${al}$., Adv. Mater. {bf 20}, 3521 (2008).], by x-ray photoemission spectroscopy (XPS), x-ray absorption spectroscopy (XAS) and x-ray magnetic circular dichroism (XMCD). From the XPS and XAS results, we find that the Cu atoms are in the Cu$^{3+}$ state with mixture of Cu$^{2+}$ in the bulk region ($sim$ 100 nm), and that Cu$^{3+}$ ions are dominant in the surface region ($sim$ 5 nm), i.e., the surface electronic structure of the surface region differs from the bulk one. From the magnetic field and temperature dependences of the XMCD intensity, we conclude that the ferromagnetic interaction in ZnO:Cu NWs comes from the Cu$^{2+}$ and Cu$^{3+}$ states in the bulk region, and that most of the doped Cu ions are magnetically inactive probably because they are antiferromagnetically coupled with each other." @default.
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• W2022035953 date "2011-10-14" @default.
• W2022035953 modified "2023-10-01" @default.
• W2022035953 title "Ferromagnetic interaction between Cu ions in the bulk region of Cu-doped ZnO nanowires" @default.
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• W2022035953 doi "https://doi.org/10.1103/physrevb.84.153203" @default.
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