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Correlation between oxygen vacancies and magnetism in Mn-doped Y2O3 nanocrystals investigated by defect engineering techniques

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14 Author(s)
Wu, T.S. ; Department of Physics, National Tsing Hua University, Hsinchu 30013, Taiwan ; Chen, Y.C. ; Shiu, Y.F. ; Peng, H.J.
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Defect engineering techniques have been employed to generate and remove oxygen vacancy defects in nanoparticles of Y2O3:Mn diluted magnetic oxide (DMO). These samples were prepared by thermal decomposition method followed by a series of thermal annealing in oxygen and forming gas. The x-ray absorption analysis reveals that O vacancies surrounding Mn and Y atoms were appreciably increased by forming-gas-annealing and decreased by oxygen-annealing, accompanied by enhanced and reduced saturation magnetization as demonstrated by magnetic measurements, respectively. Our results demonstrate strong correlation between magnetism and O vacancies and therefore strongly support the bound magnetic polaron model for these high-k DMOs.

Published in:

Applied Physics Letters  (Volume:101 ,  Issue: 2 )

Date of Publication:

Jul 2012

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