Study of magnetic behavior in hexagonal-YMn1-xFexO3 (x=0 and 0.2) nanoparticles using remanent magnetization curves

We have studied the magnetic behavior of YMn1-xFexO3 (x=0 and 0.2) nanoparticles synthesized by conventional solid state reaction method. The as-synthesized nanoparticles were found to have hexagonal phase with P6(3cm) space group confirmed by X-Ray diffraction. The particle size was found to be similar to 70 nm as confirmed by both X-Ray diffraction and Transmission Electron Microscopy. DC magnetization and memory effect measurements imply that the h-YMnO3 nanoparticles bear a resemblance to super spin-glass state following de Almeida-Thouless like behavior which is being suppressed by Fe doping. The Fe-doping in YMnO3 enhances the antiferromagnetic (AFM) transition temperature T-N to similar to 79 K and induces a new magnetic state due to the surface spins which is realized as diluted anti-ferromagnet in a field (DAFF) as explored by the thermoremanent and isothermoremanent magnetization measured with different applied magnetic field. (C) 2016 Elsevier B.V. All rights reserved.