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Issue 10, 2013
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Spin-polarized electronic structure of the core–shell ZnO/ZnO:Mn nanowires probed by X-ray absorption and emission spectroscopy

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Abstract

The combination of X-ray spectroscopy methods complemented with theoretical analysis unravels the coexistence of paramagnetic and antiferromagnetic phases in the Zn0.9Mn0.1O shell deposited onto array of wurtzite ZnO nanowires. The shell is crystalline with orientation toward the ZnO growth axis, as demonstrated by X-ray linear dichroism. EXAFS analysis confirmed that more than 90% of Mn atoms substituted Zn in the shell while a fraction of secondary phases was below 10%. The value of manganese spin magnetic moment was estimated from the Mn Kβ X-ray emission spectroscopy to be 4.3 μB which is close to the theoretical value for substitutional MnZn. However the analysis of L2,3 X-ray magnetic circular dichroism data showed paramagnetic behaviour with saturated spin magnetic moment value of 1.95 μB as determined directly from the spin sum rule. After quantitative analysis employing atomic multiplet simulations such difference was explained by a coexistence of paramagnetic phase and local antiferromagnetic coupling of Mn magnetic moments. Finally, spin-polarized electron density of states was probed by the spin-resolved Mn K-edge XANES spectroscopy and consequently analyzed by band structure calculations.

Graphical abstract: Spin-polarized electronic structure of the core–shell ZnO/ZnO:Mn nanowires probed by X-ray absorption and emission spectroscopy

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Supplementary files

Article information


Submitted
28 Apr 2013
Accepted
19 Aug 2013
First published
19 Aug 2013

J. Anal. At. Spectrom., 2013,28, 1629-1637
Article type
Paper

Spin-polarized electronic structure of the core–shell ZnO/ZnO:Mn nanowires probed by X-ray absorption and emission spectroscopy

A. A. Guda, N. Smolentsev, M. Rovezzi, E. M. Kaidashev, V. E. Kaydashev, A. N. Kravtsova, V. L. Mazalova, A. P. Chaynikov, E. Weschke, P. Glatzel and A. V. Soldatov, J. Anal. At. Spectrom., 2013, 28, 1629
DOI: 10.1039/C3JA50153A

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