Role of dopant, defect, and host oxide in the observed room temperature ferromagnetism: Co-ZnO versus Co- CeO2

Lubna R. Shah; Weigang Wang; Hao Zhu; Bakhtyar Ali; Y. Q. Song; H. W. Zhang; S. I. Shah; J. Q. Xiao

doi:10.1063/1.3068648

Role of dopant, defect, and host oxide in the observed room temperature ferromagnetism: Co-ZnO versus Co- CeO2

Lubna R. Shah, Weigang Wang, Hao Zhu, Bakhtyar Ali, Y. Q. Song, H. W. Zhang, S. I. Shah, J. Q. Xiao

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

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Abstract

A comparative study on the room temperature ferromagnetism of Co doped ZnO and CeO2 bulk samples is presented. Co-ZnO system has been observed to switch between ferromagnetic and paramagnetic by controlling the donor defects, interstitial zinc: Zni. On the other hand, Co- CeO2 is always ferromagnetic. However, ferromagnetism increases/decreases with increase/decrease in donor defects, oxygen vacancies: VO. Systemic structural, magnetic, and transport analyses reveal that the nature of donor defects and host oxide plays a vital role in establishing ferromagnetism. This study provides an insight into the underlying mechanisms that are responsible for the ferromagnetism in Co-ZnO and Co- CeO2. Moreover, the proposed mechanisms are supported by the electronic structure of magnetic impurity ions and defects.

Original language	English (US)
Article number	07C515
Journal	Journal of Applied Physics
Volume	105
Issue number	7
DOIs	https://doi.org/10.1063/1.3068648
State	Published - 2009
Externally published	Yes

ASJC Scopus subject areas

General Physics and Astronomy

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10.1063/1.3068648

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@article{ffe3045b98d142b48cf6e6c71f1dddab,

title = "Role of dopant, defect, and host oxide in the observed room temperature ferromagnetism: Co-ZnO versus Co- CeO2",

abstract = "A comparative study on the room temperature ferromagnetism of Co doped ZnO and CeO2 bulk samples is presented. Co-ZnO system has been observed to switch between ferromagnetic and paramagnetic by controlling the donor defects, interstitial zinc: Zni. On the other hand, Co- CeO2 is always ferromagnetic. However, ferromagnetism increases/decreases with increase/decrease in donor defects, oxygen vacancies: VO. Systemic structural, magnetic, and transport analyses reveal that the nature of donor defects and host oxide plays a vital role in establishing ferromagnetism. This study provides an insight into the underlying mechanisms that are responsible for the ferromagnetism in Co-ZnO and Co- CeO2. Moreover, the proposed mechanisms are supported by the electronic structure of magnetic impurity ions and defects.",

author = "Shah, {Lubna R.} and Weigang Wang and Hao Zhu and Bakhtyar Ali and Song, {Y. Q.} and Zhang, {H. W.} and Shah, {S. I.} and Xiao, {J. Q.}",

note = "Funding Information: This work is supported by DOE Grant No. DE-FG02-07ER46374 and International S&T Cooperation Program of China Grant No. 2006DFA53410.",

year = "2009",

doi = "10.1063/1.3068648",

language = "English (US)",

volume = "105",

journal = "Journal of Applied Physics",

issn = "0021-8979",

publisher = "American Institute of Physics",

number = "7",

}

TY - JOUR

T1 - Role of dopant, defect, and host oxide in the observed room temperature ferromagnetism

T2 - Co-ZnO versus Co- CeO2

AU - Shah, Lubna R.

AU - Wang, Weigang

AU - Zhu, Hao

AU - Ali, Bakhtyar

AU - Song, Y. Q.

AU - Zhang, H. W.

AU - Shah, S. I.

AU - Xiao, J. Q.

N1 - Funding Information: This work is supported by DOE Grant No. DE-FG02-07ER46374 and International S&T Cooperation Program of China Grant No. 2006DFA53410.

PY - 2009

Y1 - 2009

N2 - A comparative study on the room temperature ferromagnetism of Co doped ZnO and CeO2 bulk samples is presented. Co-ZnO system has been observed to switch between ferromagnetic and paramagnetic by controlling the donor defects, interstitial zinc: Zni. On the other hand, Co- CeO2 is always ferromagnetic. However, ferromagnetism increases/decreases with increase/decrease in donor defects, oxygen vacancies: VO. Systemic structural, magnetic, and transport analyses reveal that the nature of donor defects and host oxide plays a vital role in establishing ferromagnetism. This study provides an insight into the underlying mechanisms that are responsible for the ferromagnetism in Co-ZnO and Co- CeO2. Moreover, the proposed mechanisms are supported by the electronic structure of magnetic impurity ions and defects.

AB - A comparative study on the room temperature ferromagnetism of Co doped ZnO and CeO2 bulk samples is presented. Co-ZnO system has been observed to switch between ferromagnetic and paramagnetic by controlling the donor defects, interstitial zinc: Zni. On the other hand, Co- CeO2 is always ferromagnetic. However, ferromagnetism increases/decreases with increase/decrease in donor defects, oxygen vacancies: VO. Systemic structural, magnetic, and transport analyses reveal that the nature of donor defects and host oxide plays a vital role in establishing ferromagnetism. This study provides an insight into the underlying mechanisms that are responsible for the ferromagnetism in Co-ZnO and Co- CeO2. Moreover, the proposed mechanisms are supported by the electronic structure of magnetic impurity ions and defects.

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JF - Journal of Applied Physics

IS - 7

M1 - 07C515

ER -

Role of dopant, defect, and host oxide in the observed room temperature ferromagnetism: Co-ZnO versus Co- CeO2

Abstract

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