Correlation between oxygen vacancies and magnetism in Mn-doped Y 2O 3 nanocrystals investigated by defect engineering techniques

T. S. Wu, Y. C. Chen, Y. F. Shiu, H. J. Peng, S. L. Chang, H. Y. Lee, P. P. Chu, C. W. Hsu, L. J. Chou, C. W. Pao, J. F. Lee, J. Kwo, M. Hong, Y. L. Soo

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Abstract

Defect engineering techniques have been employed to generate and remove oxygen vacancy defects in nanoparticles of Y 2O 3: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.

Original languageEnglish
Article number022408
JournalApplied Physics Letters
Volume101
Issue number2
DOIs
StatePublished - 9 Jul 2012

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