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A study of exchange bias in BiFeO3 core/NiFe2O4 shell nanoparticles
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10.1063/1.4803549
/content/aip/journal/jap/113/17/10.1063/1.4803549
http://aip.metastore.ingenta.com/content/aip/journal/jap/113/17/10.1063/1.4803549

Figures

Image of FIG. 1.
FIG. 1.

The Rietveld-refined room temperature X-ray diffraction pattern of the BiFeO core/NiFeO shell nanoparticle sample. The Bragg peaks corresponding to the BiFeO and NiFeO are marked by B and N, respectively. The upper and lower arrays of the vertical lines show the positions of the BiFeO and NiFeO Bragg peaks, respectively. The solid line at the bottom shows the difference between observed and calculated patterns. In the inset, the X-ray diffraction pattern of the bare BiFeO nanoparticles is shown to highlight the presence of a hump.

Image of FIG. 2.
FIG. 2.

The TEM images of the BiFeO/NiFeO nanoparticles, showing the formation of a core-shell structure.

Image of FIG. 3.
FIG. 3.

The temperature-dependence of the FC and ZFC magnetizations of the BiFeO core/NiFeO shell nanoparticles, under different magnetic fields, . 0.05, 0.5, and 4 T.

Image of FIG. 4.
FIG. 4.

(a) The Rietveld-refined neutron diffraction patterns of the BiFeO core/NiFeO shell nanoparticles, at 6 and 300 K. The -axis corresponds to the magnitude of the scattering vector Q [= (4π/λ) sin θ], where λ is the wavelength of the neutrons and 2θ is the scattering angle. The solid line at the bottom shows the difference between observed and calculated patterns. The first (top most) and second arrays of the vertical lines show the positions of the BiFeO nuclear and magnetic peaks, respectively. The third and fourth arrays of the vertical lines show the positions of the NiFeO nuclear and magnetic peaks, respectively. (b) An enlarged view of the main magnetic peaks of BFO and NFO.

Image of FIG. 5.
FIG. 5.

(a) The ZFC and FC hysteresis loops of the BiFeO core/NiFeO shell nanoparticles at 5 K. The FC hysteresis loops were recorded under 2 and 5-T cooling fields. The linear curve shows the hysteresis loop of the bare BiFeO nanoparticles. (b) An enlarged view showing the magnitudes of the coercivity and remanent magnetization of both ZFC and FC hysteresis loops of the core-shell nanoparticles. (c) The temperature-dependence of magnetization at 9 T, and coercivity of the BiFeO core/NiFeO shell nanoparticles, obtained from the ZFC hysteresis loops.

Tables

Generic image for table
Table I.

The structural parameters, derived from the Rietveld analysis of the x-ray diffraction pattern of the BiFeO core/NiFeO shell nanoparticles. The conventional reliability indices for goodness of fitting are also given.

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/content/aip/journal/jap/113/17/10.1063/1.4803549
2013-05-02
2014-04-20
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: A study of exchange bias in BiFeO3 core/NiFe2O4 shell nanoparticles
http://aip.metastore.ingenta.com/content/aip/journal/jap/113/17/10.1063/1.4803549
10.1063/1.4803549
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