Emergent ferromagnetism in ZnO/Al2O3 core-shell nanowires: Towards oxide spinterfaces

G. Z. Xing, D. D. Wang, C.-J. Cheng, M. He, S. Li, Tao Wu

Research output: Contribution to journalArticlepeer-review

67 Scopus citations

Abstract

We report that room-temperature ferromagnetism emerges at the interface formed between ZnO nanowire core and Al2O3 shell although both constituents show mainly diamagnetism. The interface-based ferromagnetism can be further enhanced by annealing the ZnO/Al2O3 core-shell nanowires and activating the formation of ZnAl2O4 phase as a result of interfacial solid-state reaction. High-temperature measurements indicate that the magnetic order is thermally stable up to 750 K. Transmission electron microscopy studies reveal the annealing-induced jagged interfaces, and the extensive structural defects appear to be relevant to the emergent magnetism. Our study suggests that tailoring the spinterfaces in nanostructure-harnessed wide-band-gap oxides is an effective route towards engineered nanoscale architecture with enhanced magnetic properties.
Original languageEnglish (US)
Pages (from-to)022402
JournalApplied Physics Letters
Volume103
Issue number2
DOIs
StatePublished - Jul 8 2013

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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