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2012 | 121 | 4 | 950-953
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Structural and Magnetic Features of Mn_{1-x}Zn_xFe_2O_4 Nanoparticles

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This paper reports on the magnetic properties of Mn_{1-x}Zn_x-ferrite nanoparticles. Different x compositions of the magnetic material have been considered. Field- and temperature-dependent magnetization curves and electron paramagnetic resonance (EPR) at different temperatures were used to reveal the magnetic properties of the samples. For x=0.5, the EPR spectra consist of a single resonance signal, strongly symmetrical, with g = 3.25 close to 2073 G, and an asymmetric line corresponding to g = 4.4 for x = 0. The asymmetry is attributed to a random distribution of the anisotropy in the system, with perpendicular and parallel modes, giving information about the effective anisotropy of the system. For high concentrations, the resonant field shifts to 2875 G. Magnetization measurements as function of temperature at 60 Oe according to the standard zero field cooling (ZFC) and field cooling (FC) procedures are reported. The behavior of field cooling magnetization (MFC) at low temperatures evidences the presence of strong interparticles interactions.
  • Magnetic Materials and Nanostructures Group, Phys. Dep., Universidad Nacional de Colombia, Carrera 45 No 26-85, Bogotá, Colombia
  • Excellence Center for Novel Materials, CENM, Calle 13 N.100-00 Building 320 ofice 1030, Cali, Colombia
  • Physics Department, Universidad Nacional de Colombia, Carrera 45 No 26-85, Bogotá, Colombia
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