Zn-Mn-O: Ferromagnet at room temperature
Babić-Stojić Branka S.
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Semiconductor Zn-Mn-O crystallites were synthesized by a solid state reaction method starting from the thermal decomposition of the appropriate oxalates. Samples were thermally treated in air at temperatures ranging from 400 to 900 degrees C. The nominal concentrations of manganese were x = 0.01, 0.02, 0.04 and 0.10. The samples were investigated by the X-ray powder diffraction method, magnetization measurements and by electron paramagnetic resonance. X-ray diffractgrams show a dominant wurtzite structure of Zn-Mn-O. Room temperature ferromagnelism was observed in Zn-Mn-O samples with manganese concentrations x:! 0.04, thermally treated at low temperature (500 degrees C). The saturation magnetization for the sample with x = 0.01 was 0.05 mu(B)/Mn. The room temperature ferromagnetism seems to be due to the diffusion of Zn into the Mn-oxides gains.
Keywords:magnetic semiconductors / a room temperature ferromagnetism / Zn-Mn-O
Source:Hemijska industrija, 2007, 61, 3, 147-151
- 5th Young Researchers Seminar, Dec 25-26, 2006, Belgrade, Serbia