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Nature of room-temperature ferromagnetism from undoped ZnO nanoparticles

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Abstract

ZnO nanoparticles were synthesized by a sol–gel calcination process following being annealed in air at 400, 600, 800 and 1000°C. X-ray diffraction pattern and X-ray photoelectron spectroscopy show that all the samples present a typical wurtzite structure and no other impurity phases are observed. Room-temperature ferromagnetism from all the samples is confirmed by the vibrating sample magnetometer measurements, which shows that the RTFM decreases with the annealing temperature increasing from 400 to 800°C, and then became larger for the sample annealed at 1000°C. According to the Raman scattering spectra and electron paramagnetic resonance, the RTFM of samples annealed at 600, 800 and 1000°C might be related to the oxygen vacancy related defects. However, the RTFM from the sample annealed at 400°C, presenting nearly the same value as that of the sample annealed at 1000°C, could originate with the interstitial zinc defects associated with XPS and photoluminescence analyses.

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Authors and Affiliations

  1. Department of Physics, Jinan University, Guangzhou, 510632, China

    Yongzhe Zhang

  2. Department of Physics, Lanzhou University, Lanzhou, 730000, China

    Erqing Xie

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  1. Yongzhe Zhang
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  2. Erqing Xie
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Correspondence to Yongzhe Zhang.

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Zhang, Y., Xie, E. Nature of room-temperature ferromagnetism from undoped ZnO nanoparticles. Appl. Phys. A 99, 955–960 (2010). https://doi.org/10.1007/s00339-010-5703-3

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  • DOI: https://doi.org/10.1007/s00339-010-5703-3

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