Thermal annealing and grain boundary effects on ferromagnetism in Y2O3:Co diluted magnetic oxide nanocrystals

被引：154

作者：

Soo, Y. L. ^{[1
,2
]}

Wu, T. S. ^{[1
]}

Wang, C. S. ^{[1
]}

Chang, S. L. ^{[1
,2
]}

Lee, H. Y. ^{[3
]}

Chu, P. P. ^{[3
]}

Chen, C. Y. ^{[4
]}

Chou, L. J. ^{[4
]}

Chan, T. S. ^{[2
]}

Hsieh, C. A. ^{[2
]}

Lee, J. F. ^{[2
]}

Kwo, J. ^{[1
,5
]}

Hong, M. ^{[4
]}

机构：

[1] Natl Tsing Hua Univ, Dept Phys, Hsinchu 30013, Taiwan

[2] Natl Synchrotron Radiat Res Ctr, Hsinchu, Taiwan

[3] Natl Cent Univ, Dept Chem, Jhongli 32001, Taiwan

[4] Natl Tsing Hua Univ, Dept Mat Sci & Engn, Hsinchu 30013, Taiwan

[5] Natl Taiwan Univ, Ctr Condensed Matter Sci, Taipei 10617, Taiwan

来源：

APPLIED PHYSICS LETTERS | 2011年 / 98卷 / 03期

关键词：

ABSORPTION FINE-STRUCTURE; LOCAL STRUCTURES; SEMICONDUCTORS;

D O I：

10.1063/1.3544059

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

Structures and magnetic properties of Y2O3: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 Y2O3 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. (C) 2011 American Institute of Physics. [doi:10.1063/1.3544059]

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页数：3

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