High TC ferromagnetism of Zn(1-x)CoxO diluted magnetic semiconductors grown by oxygen plasma-assisted molecular beam epitaxy

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Co-doped wurtzite ZnO [Zn_(1-x)Co_xO] thin films have been grown on Al₂O₃(0001) substrates by using oxygen plasma-assisted molecular beam epitaxy at the low growth temperature of 450 °C. The epitaxial films of Co concentration at 0≤x≤0.12 are single crystalline, which were examined by reflection high energy electron diffraction and x-ray diffraction. Both of optical transmission spectrum and in situ. x-ray photoelectron spectroscopy studies confirmed the incorporation of Co²⁺ cations into wurtzite ZnO lattice. Magnetic measurements revealed that the Zn_(1-x)Co_xO thin films are ferromagnetic with Curie temperature T_C above room temperature, and the ferromagnetism shows intrinsic characteristic.

Published in:
Applied Physics Letters (Volume:90 , Issue: 5 )

Date of Publication: Jan 2007

Page(s):: 052504 - 052504-3
ISSN :: 0003-6951
Digital Object Identifier :: 10.1063/1.2437111
Product Type:: Journals & Magazines

Date of Current Version :: 18 June 2009
Issue Date :: Jan 2007

Author(s)

Liu, G.L.
School of Physics and Microelectronics, Shandong University, Jinan, Shandong 250100, People’s Republic of China and National Key Laboratory of Crystal Materials, Shandong University, Jinan, Shandong 250100, People’s Republic of China
Cao, Q. ; Deng, J.X. ; Xing, P.F. ; Tian, Y.F. ; Chen, Y.X. ; Yan, S.S. ; Mei, L.M.