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Issue 9, 2013
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Dual-donor (Zni and VO) mediated ferromagnetism in copper-doped ZnO micron-scale polycrystalline films: a thermally driven defect modulation process

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Abstract

The paper reports robust ferromagnetic Cu-doped ZnO micron-scale polycrystalline films via spin-coating using high-quality doped nanocrystals. A reliable magnetic response is observed in the 900 °C vacuum annealed film without any ferromagnetic contribution from other sources. Post-annealing treatment in terms of atmosphere and temperature can control the proportion of oxygen vacancies (VO) and zinc interstitials (Zni) defects and further help to precisely regulate defect-related ferromagnetic behavior. Complex charge transfer processes derived from dual-donor (Zni and VO) to Cu acceptor are revealed by photoluminescence (PL) and electron paramagnetic resonance (EPR) spectra. Based on the above, specific charge transfer (CT)-type Stoner splitting and indirect double-exchange mechanisms are proposed to understand the ferromagnetic origin. The improvable FM performance and annealing-specific modulation further indicate that a thermal driven process can delicately tailor the magnetic property of the transition metal ion-doped ZnO system.

Graphical abstract: Dual-donor (Zni and VO) mediated ferromagnetism in copper-doped ZnO micron-scale polycrystalline films: a thermally driven defect modulation process

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Publication details

The article was received on 08 Jan 2013, accepted on 27 Feb 2013 and first published on 04 Mar 2013


Article type: Paper
DOI: 10.1039/C3NR00136A
Citation: Nanoscale, 2013,5, 3918-3930

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    Dual-donor (Zni and VO) mediated ferromagnetism in copper-doped ZnO micron-scale polycrystalline films: a thermally driven defect modulation process

    L. Hu, J. Huang, H. He, L. Zhu, S. Liu, Y. Jin, L. Sun and Z. Ye, Nanoscale, 2013, 5, 3918
    DOI: 10.1039/C3NR00136A

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