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Enhanced ferromagnetism in CuO nanowires on the top of CuO nanograins
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10.1063/1.4829284
/content/aip/journal/jap/114/17/10.1063/1.4829284
http://aip.metastore.ingenta.com/content/aip/journal/jap/114/17/10.1063/1.4829284
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

(a) SEM micrograph and (b) Rietveld refinement of the XRD pattern of the nanostructured sample. Tick marks below the pattern indicate the expected Bragg reflection positions for cubic and monoclinic crystal phases.

Image of FIG. 2.
FIG. 2.

(a)–(c) SEM images of the nanostructured sample with higher CuO/CuO ratio. The inset of (a) shows a TEM image of a nanowire along with its electron diffraction pattern. The inset displays a thin layer of Cu O nanograins. (d) Rietveld refinement of the XRD pattern.

Image of FIG. 3.
FIG. 3.

(a)–(c) SEM micrographs and (d) XRD pattern with Rietveld refinement of the sample after a heat treatment at 900 °C.

Image of FIG. 4.
FIG. 4.

(a) Magnetization measured at H = 5 kOe versus temperature for CuO nanograins on CuO. The inset shows hysteresis measurement at two temperatures and diamagnetic contributions—the theoretically expected (black) and observed (red) taking into account the data at high magnetic field extrapolated to low field. (b) Magnetization versus magnetic field measured at different temperatures.

Image of FIG. 5.
FIG. 5.

(a) Magnetic susceptibility (χ = M/H) measured at H = 0.5, 1, and 5 kOe for CuO nanowires/grains on the CuO layer. (b) Magnetization as a function of magnetic field measured at different temperatures. The dashed line is the observed diamagnetic contribution. The inset shows an expanded view of the data at low magnetic field.

Image of FIG. 6.
FIG. 6.

(a) Magnetization as a function of temperature (FC) measured at H = 5 kOe for the sample after the heat treatment. The FC and ZFC measurements of CuO NWs on NGs + CuO shown in Fig. 5(a) are plotted again for comparison. (b) Magnetization versus magnetic field measured at different temperatures for AFM CuO bulk sample. The upper inset shows an expanded view of the data at low magnetic field and the lower inset is the coercive field versus temperature for CuO bulk and CuO NWs/NGs.

Image of FIG. 7.
FIG. 7.

(a) The saturation magnetization as a function of temperature for both CuO NGs and CuO NWs on NGs and (b) Bohr magneton versus magnetic field for the CuO NGs and CuO NWs on NGs.

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/content/aip/journal/jap/114/17/10.1063/1.4829284
2013-11-05
2014-04-17
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Enhanced ferromagnetism in CuO nanowires on the top of CuO nanograins
http://aip.metastore.ingenta.com/content/aip/journal/jap/114/17/10.1063/1.4829284
10.1063/1.4829284
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