Room Temperature Ferromagnetism in Ni Doped ZnO Powders |
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| Authors: | Rui Bin Zhao Deng Lu Hou Jun Mei Guo Cong Mian Zhen Gui De Tang |
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| Affiliation: | (1) Joint Department of Biomedical Engineering, University of North Carolina, Chapel Hill, NC 27599, USA;(2) Department of Materials Science and Engineering, North Carolina State University, Raleigh, NC 27695, USA;(3) Present address: Intel, Hillsboro, OR 97124, USA;(4) Department of Materials Science and Engineering, North Carolina State University, Raleigh, NC 27695, USA;(5) Present address: Case Western Reserve University, Cleveland, OH 44106, USA;(6) Department of Materials Science and Engineering, North Carolina State University, Raleigh, NC 27695, USA;(7) Department of Chemistry, North Carolina State University, Raleigh, NC 27695, USA;(8) Mechanical and Chemical Engineering Department, North Carolina A&T State University, Greensboro, NC 27411, USA;; |
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| Abstract: | Zn1−x
Ni
x
O (x=0.1%, 0.4%, 0.7%, 1.0%) powders were prepared using the sol-gel technique, and the structural, optical, and magnetic properties
of the samples were investigated. X-ray diffraction measurements show that all samples have a wurtzite structure and that
the c-axis lattice constant decreases as the Ni content increases. X-ray photoelectron spectroscopy studies reveal that the doped
Ni ions are in divalent states in all samples. Optical absorption spectra show that the band energy of Zn1−x
Ni
x
O powders decreases with increasing Ni concentration. Photoluminescence measurements of Zn1−x
Ni
x
O show a broad peak at a wavelength centered at about 467 nm which indicates the presence of a fraction of defects in ZnO.
The room temperature ferromagnetism observed in all samples is intrinsic in nature. |
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