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 journalArticle

18 Scopus citations

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 languageEnglish (US)
Article number07C515
JournalJournal of Applied Physics
Volume105
Issue number7
DOIs
StatePublished - Apr 27 2009
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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