Magnetic study of nanocrystalline 0.95MnO/0.05ZnO

作者：Guskos N; Dudek M; Zolnierkiewicz G; Typek J^*; Berczynski P; Lendzion Bielun Z; Sibera D; Narkiewicz U

来源：Journal of Magnetism and Magnetic Materials, 2013, 326: 225-231.

DOI：10.1016/j.jmmm.2012.09.018

• Magnetic resonance
• Magnetic nanoparticle

Nanocrystalline 0.95MnO/0.05ZnO sample has been prepared by coprecipitation and calcination processes. X-ray diffraction showed the presence of Mn3O4 nanocrystallites with an average size of 43 nm. Magnetic properties of the 0.95MnO/0.05ZnO sample have been investigated by dc magnetization and magnetic resonances (electron paramagnetic resonance (EPR), ferromagnetic resonance (FMR)) methods. The magnetization study has shown the presence of dominating Mn3O4 paramagnetic and ferrimagnetic (below 46 K) phases. The blocking temperature determined from magnetization measurements was 41 K. An FMR study has shown the evidence of the spread of nanoparticles sizes. An EPR signal from paramagnetic phase of Mn3O4 was observed at temperatures above 45 K and from defects/spurious phases in the low temperature range (T %26lt; 16 K). Magnetic anisotropies of the sample in the FMR spectra were taken into account by fitting the observed spectra by two lines corresponding to parallel and perpendicular orientations of nanoparticles in an applied magnetic field.

• 出版日期2013-1