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

doi:10.1063/1.3544059

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

Department of Chemistry

Research output: Contribution to journal › Article › peer-review

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Abstract

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.

Original language	English
Article number	031906
Journal	Applied Physics Letters
Volume	98
Issue number	3
DOIs	https://doi.org/10.1063/1.3544059
State	Published - 17 Jan 2011

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

abstract = "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.",

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

note = "Funding Information: The present research has been supported by National Science Council, Taiwan, under Project No. 97-2112-M-007-023-MY3, and by Academia Sinica (Project No. AS-98-TP-A03). ",

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TY - JOUR

T1 - Thermal annealing and grain boundary effects on ferromagnetism in Y 2 O3:Co diluted magnetic oxide nanocrystals

AU - Soo, Y. L.

AU - Wu, T. S.

AU - Wang, C. S.

AU - Chang, S. L.

AU - Lee, H. Y.

AU - Chu, P. P.

AU - Chen, C. Y.

AU - Chou, L. J.

AU - Chan, T. S.

AU - Hsieh, C. A.

AU - Lee, J. F.

AU - Kwo, J.

AU - Hong, M.

N1 - Funding Information: The present research has been supported by National Science Council, Taiwan, under Project No. 97-2112-M-007-023-MY3, and by Academia Sinica (Project No. AS-98-TP-A03).

PY - 2011/1/17

Y1 - 2011/1/17

N2 - 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.

AB - 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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U2 - 10.1063/1.3544059

DO - 10.1063/1.3544059

M3 - 期刊論文

AN - SCOPUS:79251537813

SN - 0003-6951

VL - 98

JO - Applied Physics Letters

JF - Applied Physics Letters

IS - 3

M1 - 031906

ER -

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

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