Tuning ferromagnetism in Mgx Zn1-x O thin films by band gap and defect engineering

Yongfeng Li*, Rui Deng, Bin Yao, Guozhong Xing, Dandan Wang, Tao Wu

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

92 Scopus citations

Abstract

We investigate the room temperature ferromagnetism in band gap tunable Mgx Zn1-x O (x≤0.22) alloy thin films and find that ferromagnetism is significantly enhanced in p-type MgxZn 1-x O (x≤0.17) compared with the n-type counterparts (x≤0.15). Temperature-dependent photoluminescence measurements reveal the correlation between the p-type behavior, enhanced ferromagnetism, and zinc vacancies. First-principle calculations demonstrate that the formation energy of zinc vacancies decreases with the increasing Mg content and the zinc vacancies in Mgx Zn1-x O alloys stabilize the ferromagnetic coupling. Our results suggest a viable route to tune the magnetic properties of oxides through band gap and defect engineering.

Original languageEnglish (US)
Article number102506
JournalApplied Physics Letters
Volume97
Issue number10
DOIs
StatePublished - Sep 6 2010

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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