Role of donor-acceptor complexes and impurity band in stabilizing ferromagnetic order in Cu-doped SnO 2 thin films

Yongfeng Li*, Rui Deng, Yufeng Tian, Bin Yao, Tao Wu

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

74 Scopus citations

Abstract

Our complementary magnetic and photoluminescence measurements reveal the correlation between the donor-acceptor complex and the ferromagnetic order in Cu-doped SnO 2 thin films. Oxygen vacancies (V O) and Cu dopants form defect complexes of donor-acceptor pairs, and the associated spin-polarized impurity band leads to the narrowing of bandgap. Electronic structure calculations based on the first-principles method demonstrate that the Cu-V O complex has low formation energy and can stabilize the ferromagnetic coupling. Our results suggest that intrinsic defects and their complexes with dopants play a key role for establishing the ferromagnetic order in doped wide-bandgap oxides.

Original languageEnglish (US)
Article number172402
JournalApplied Physics Letters
Volume100
Issue number17
DOIs
StatePublished - Apr 23 2012

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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