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Title: Reversible switching of ferromagnetism in ZnCuO nanorods by electric field

The reproducible switching of ferromagnetism in ZnCuO nanorods by applying a reversible electric field has been realized. High-resolution transmission electron microscopy images showed a hexagonal wurtzite structure with no detectable trace of secondary phase or precipitation of Cu impurity in the ZnCuO nanorods. The Cu concentrations in the ZnCuO nanorods were tested by energy dispersive spectroscopy and x-ray photoelectron spectroscopy and found to be about 2.7 at. %. The switching mechanism is confirmed in terms of the formation and rupture of conductive filaments, with oxygen vacancies (V{sub O}) localized mainly on surface of the ZnCuO nanorods. Subsequently, the variation of V{sub O} concentration during the resistive switching process modulates the ferromagnetism of the ZnCuO nanorods. The saturation magnetization at low resistance state is apparently 6.4 times larger than that at high resistance state for an Au/ZnCuO/ITO structure. An indirect double-exchange model has been used to explain the ferromagnetism in ZnCuO nanorods.
Authors:
; ; ;  [1]
  1. Department of Physics and Development Center for New Materials Engineering and Technology in Universities of Guangdong, Lingnan Normal University, Zhanjiang 524048 (China)
Publication Date:
OSTI Identifier:
22398855
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 106; Journal Issue: 14; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
77 NANOSCIENCE AND NANOTECHNOLOGY; CONCENTRATION RATIO; COPPER OXIDES; ELECTRIC CONDUCTIVITY; ELECTRIC FIELDS; FERROMAGNETISM; HEXAGONAL LATTICES; MAGNETIZATION; NANOSTRUCTURES; OXYGEN; PRECIPITATION; SURFACES; TRANSMISSION ELECTRON MICROSCOPY; VACANCIES; X-RAY PHOTOELECTRON SPECTROSCOPY; ZINC COMPOUNDS