Ferromagnetism in dilute magnetic semiconductors through defect engineering: Li-doped ZnO

J. B. Yi, C. C. Lim, G. Z. Xing, H. M. Fan, L. H. Van, S. L. Huang, K. S. Yang, X. L. Huang, X. B. Qin, B. Y. Wang, Tao Wu, L. Wang, H. T. Zhang, X. Y. Gao, T. Liu, A. T.S. Wee, Y. P. Feng, J. Ding

Research output: Contribution to journalArticlepeer-review

388 Scopus citations

Abstract

We demonstrate, both theoretically and experimentally, that cation vacancy can be the origin of ferromagnetism in intrinsic dilute magnetic semiconductors. The vacancies can be controlled to tune the ferromagnetism. Using Li-doped ZnO as an example, we found that while Li itself is nonmagnetic, it generates holes in ZnO, and its presence reduces the formation energy of Zn vacancy, and thereby stabilizes the zinc vacancy. Room temperature ferromagnetism with p type conduction was observed in pulsed laser deposited ZnO:Li films with certain doping concentration and oxygen partial pressure.

Original languageEnglish (US)
Article number137201
JournalPhysical Review Letters
Volume104
Issue number13
DOIs
StatePublished - Mar 29 2010

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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