Magnetic Resonance Study of MnO/ZnO Nanopowders

N. Guskosa, b, G. Zolnierkiewiczb, J. Typekb, D. Siberac, U. Narkiewiczc and W. Łojkowskid aSolid State Section, Department of Physics, University of Athens, Panepistimiopolis, 15 784, Greece bInstitute of Physics, West Pomeranian University of Technology, al. Piastów 48, 70-311 Szczecin, Poland cInstitute of Chemical and Environmental Engineering, West Pomeranian University of Technology, al. Piastów 17, 70-310 Szczecin, Poland dInstitute of High Pressure Physics, Polish Academy of Sciences, Sokołowska 29/37, 01-142 Warsaw, Poland

Received: May 18, 2011

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Fine particles n(MnO)/-(1-n)ZnO (n = 0.05 to 0.95) were prepared by wet chemistry method. According to X-ray diffraction analysis the obtained samples with n = 0.95, 0.90, 0.80, 0.70, 0.60 contained Mn3O4 and ZnMn2O4 phases, while samples with n = 0.05, 0.10, 0.20, 0.30, 0.40 and 0.50 contained ZnMnO3 and ZnO phases. The mean crystalline size of ZnMnO3 varied from 8 to 13 nm. The magnetic resonance investigations have been carried out at room temperature. Slightly asymmetric, broad and intense magnetic resonance line is recorded for all samples. The magnetic resonance spectra parameters showed marked differences depending on the composition index n. This could be explained by the variation of the magnetic susceptibility and a much slower evolution of spin relaxation, associated with the interaction of crystal field and superexchange interactions. Taking into account the values of magnetic resonance parameters, the investigated samples could be divided into two groups: these with the composition index n<0.50 and those with n>0.50. A detailed discussion of the magnetic properties of different phases in the n(MnO)/-(1-n)ZnO system is presented.

DOI: 10.12693/APhysPolA.120.1074 PACS numbers: 75.50.Tt, 76.30.Fc, 76.50.+g