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Defect mediated ferromagnetism in Ni-doped ZnO nanocrystals evidenced by positron annihilation spectroscopy
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10.1063/1.4759136
/content/aip/journal/jap/112/8/10.1063/1.4759136
http://aip.metastore.ingenta.com/content/aip/journal/jap/112/8/10.1063/1.4759136
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Figures

Image of FIG. 1.
FIG. 1.

X-ray diffraction patterns of (a) 4 at. % NiO/ZnO and (b) 20 at. % NiO/ZnO nanocomposites annealed at different temperatures. The diffraction lines can be assigned to ZnO and NiO (open triangles).

Image of FIG. 2.
FIG. 2.

Raman spectra recorded for (a) 4 at. %NiO/ZnO and (b) 20 at. %NiO/ZnO nanocomposites annealed at 100, 400, 700, 1000, and 1200 °C, and ZnO single crystals.

Image of FIG. 3.
FIG. 3.

, and the relative intensity of 4 at. % NiO/ZnO nanocomposites after annealing at different temperatures.

Image of FIG. 4.
FIG. 4.

, and the relative intensity of 20 at. % NiO/ZnO nanocomposites after annealing at different temperatures.

Image of FIG. 5.
FIG. 5.

The S-parameter versus the annealing temperature for (a) 4 at. % NiO/ZnO and (b) 20 at. % NiO/ZnO nanocomposites.

Image of FIG. 6.
FIG. 6.

Variation of S parameter with W parameter for (a) 4 at. % NiO/ZnO and (b) 20 at. % NiO/ZnO nanocomposites annealed at different temperatures.

Image of FIG. 7.
FIG. 7.

M-H curves for 4 at. % NiO/ZnO nanocomposites annealed at different temperatures.

Image of FIG. 8.
FIG. 8.

M-H curves for 20 at. % NiO/ZnO nanocomposites annealed at different temperatures.

Image of FIG. 9.
FIG. 9.

Saturation magnetization as a function of annealing temperature for NiO/ZnO nanocomposites.

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/content/aip/journal/jap/112/8/10.1063/1.4759136
2012-10-17
2014-04-19
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Defect mediated ferromagnetism in Ni-doped ZnO nanocrystals evidenced by positron annihilation spectroscopy
http://aip.metastore.ingenta.com/content/aip/journal/jap/112/8/10.1063/1.4759136
10.1063/1.4759136
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