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Synthesis, structure, and magnetic behavior of nanoparticles of cubic ZnMnO3
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Image of FIG. 1.
FIG. 1.

Comparison of the experimental x-ray diffraction pattern (top) with the simulated spectra for structures #3 (middle) and #4 (bottom) of Table I with Miller indices of the prominent lines shown.

Image of FIG. 2.
FIG. 2.

Transmission electron micrograph under bright field conditions is shown in (a) with the corresponding SAD pattern of ZnMnO3 shown in (b).

Image of FIG. 3.
FIG. 3.

Temperature dependence (2–100 K) of the magnetic susceptibility χ = M/H for the ZFC and FC cases in H = 100 Oe. The inset shows χ vs. T data around TS ≃ 7 K in H = 50, 200, 300, and 550 Oe.

Image of FIG. 4.
FIG. 4.

Plots of χ vs T and χ−1 vs. T for temperatures up to 370 K. The solid lines are fits to the Neel’s expression for ferrimagnets.

Image of FIG. 5.
FIG. 5.

Low field region (up to ±1.5 kOe) of the hysteresis loops for ZFC (upper) and FC (lower) cases at select T with the sample for FC case cooled from 100 K to the measuring temperature in H = 20 kOe.

Image of FIG. 6.
FIG. 6.

Temperature dependence of coercivity Hc and exchange bias Heb for the ZFC and FC cases. In the inset, cooling field dependence of Hc and Heb is plotted. Lines connecting the data points are visual guides.

Image of FIG. 7.
FIG. 7.

M vs. H plots up to H = 65 kOe at select temperatures shown; Also plotted is the data of M at 3 K vs. 1/H to determine MS in the limit 1/H → 0.


Generic image for table
Table I.

Calculated magnetic moment per Mn(μ p), saturation magnetization (MS), and oxygen deficiency parameter (δ) of composition ZnMnO3-δ for four possible spinel structures and the experimental data; and Δ represent vacancy at B- and O-sites, respectively.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Synthesis, structure, and magnetic behavior of nanoparticles of cubic ZnMnO3