Hauptseite > Publikationsdatenbank > MnO nanoparticles as the cause of ferromagnetism in bulk dilute Mn-doped ZnO |
Journal Article | FZJ-2017-01587 |
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2016
American Inst. of Physics
Melville, NY
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Please use a persistent id in citations: http://hdl.handle.net/2128/17236 doi:10.1063/1.4972956
Abstract: We show that the observed ferromagnetic behavior of ZnO lightly doped with Mn coincides with the presence of MnO nanoparticles, whereas cluster-free Mn doped ZnO behaves paramagnetically. This conclusion is reached by a study of the structural and magnetic properties of powdered samples of (Mnx,Zn1–x)O with x ≤ 0.033 using polarized neutron scattering. Two types of samples were synthesized via, respectively, a solid state method and the decomposition of hydrozincite. Further characterization has been performed using standard X-ray diffraction and magnetization measurements. The results show evidence for the formation of MnO nanoparticles in the highest doped samples for both synthesis methods, with a ferromagnetic behavior attributed to uncompensated Mn2+ in the MnO nanoparticles. The lower Mn-doped samples showed no evidence for structural segregation or magnetic correlations and showed only a paramagnetic behaviour.
Keyword(s): Magnetic Materials (1st) ; Magnetism (2nd)
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