Thermal annealing and grain boundary effects on ferromagnetism in Y(2)O(3):Co diluted magnetic oxide nanocrystals

Please use this identifier to cite or link to this item: http://ir.lib.ncu.edu.tw/handle/987654321/50950

Title:	Thermal annealing and grain boundary effects on ferromagnetism in Y(2)O(3):Co diluted magnetic oxide nanocrystals
Authors:	Soo,YL;Wu,TS;Wang,CS;Chang,SL;Lee,HY;Chu,PP;Chen,CY;Chou,LJ;Chan,TS;Hsieh,CA;Lee,JF;Kwo,J;Hong,M
Contributors:	化學學系
Keywords:	ABSORPTION FINE-STRUCTURE;LOCAL STRUCTURES;SEMICONDUCTORS
Date:	2011
Issue Date:	2012-03-27 18:13:31 (UTC+8)
Publisher:	國立中央大學
Abstract:	Structures and magnetic properties of Y(2)O(3):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 Y(2)O(3) 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]
Relation:	APPLIED PHYSICS LETTERS
Appears in Collections:	[Department of Chemistry] journal & Dissertation

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