Τίτλος:
Magnetic study of nanocrystalline 0.95MnO/0.05ZnO
Γλώσσες Τεκμηρίου:
Αγγλικά
Περίληψη:
Nanocrystalline 0.95MnO/0.05ZnO sample has been prepared by coprecipitation and calcination processes. X-ray diffraction showed the presence of Mn 3O 4 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 Mn 3O 4 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 Mn 3O 4 was observed at temperatures above 45 K and from defects/spurious phases in the low temperature range (T<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. © 2012 Elsevier B.V.
Συγγραφείς:
Guskos, N.
Dudek, M.
Zolnierkiewicz, G.
Typek, J.
Berczynski, P.
Lendzion-Bielun, Z.
Sibera, D.
Narkiewicz, U.
Περιοδικό:
Journal of Magnetism and Magnetic Materials
Λέξεις-κλειδιά:
Applied magnetic fields; Average size; Blocking temperature; DC magnetization; EPR signals; FMR study; Low temperatures; Magnetic nanoparticles; Magnetic studies; Magnetization measurements; Nanocrystallines; Paramagnetic phase; Perpendicular orientation; Two-line, Calcination; Magnetic properties; Magnetic resonance; Magnetization; Manganese; Nanoparticles; Paramagnetism; X ray diffraction; Zinc oxide, Ferromagnetic resonance
DOI:
10.1016/j.jmmm.2012.09.018
