Thermal annealing and grain boundary effects on ferromagnetism in Y 2 O3:Co diluted magnetic oxide nanocrystals

Y. L. Soo, T. S. Wu, C. S. Wang, S. L. Chang, H. Y. Lee, P. P. Chu, C. Y. Chen, L. J. Chou, T. S. Chan, C. A. Hsieh, J. F. Lee, J. Kwo, M. Hong

研究成果: 雜誌貢獻期刊論文同行評審

10 引文 斯高帕斯(Scopus)

摘要

Structures and magnetic properties of Y2 O3:Co nanocrystals were investigated using high resolution transmission electron microscopy, x-ray diffraction, x-ray absorption fine structures, and superconducting quantum interference device. Cobalt atoms were found to be driven by thermal annealing from interstitial locations inside the Y2 O3 nanoparticles toward particle surface, where increased O vacancies surrounding Co atoms led to increased saturation magnetization. Our results strongly support a bound magnetic polaron model for ferromagnetism in diluted magnetic oxides mostly due to magnetic dopants located on the grain boundaries.

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文章編號031906
期刊Applied Physics Letters
98
發行號3
DOIs
出版狀態已出版 - 17 1月 2011

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