Synthesis and magnetic properties of hybrid nanostructures of Pt–FexOy

Abstract

We report the synthesis conditions and magnetic properties of Pt and iron oxide (Pt–Fe_xO_y) hybrid nanostructures. The injection time and temperature of the Fe precursor after the decomposition of the Pt precursor are found to be the key parameters for the tuning of FePt to Pt–Fe_xO_y nanoparticles. The particle shape can be controlled from spherical to cubic by selective molar ratios of surfactants and solvents. A comparative study of the dynamic and static magnetic properties of Pt–Fe_xO_y and Fe_xO_y, (after etching of Pt) is presented. The effective anisotropy of Pt–Fe_xO_y is found to be one order of magnitude higher than that of etched Fe_xO_y. Consequently, a strong enhancement of the blocking temperature is observed which is attributed to the enhanced interfacial anisotropy between Pt and Fe_xO_y layers.