Dresden 2011 – scientific programme

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MA: Fachverband Magnetismus

MA 12: Magnetic Particles/ Clusters II

MA 12.3: Talk

Monday, March 14, 2011, 17:30–17:45, HSZ 103

Carbon-coated NiPt, CoPt nanoalloys: size control and magnetic properties — •A. A. El-Gendy^1,2, S. Hampel², A. Leonhardt², V. Khavrus², B. Buechner², and R. Klingeler¹ — ¹Kirchhoff Institute for Physics, University of Heidelberg, D-69120 Heidelberg, Germany — ²Leibniz Institute for Solid State and Materials Research (IFW) Dresden, Germany

Controlled synthesis of magnetic nanoparticles with well-defined size and composition is always a challenge in material-based nanoscience. Here, we apply the high pressure chemical vapour deposition technique (HPCVD) to obtain carbon-shielded magnetic alloy nanoparticles under control of the particle size. Carbon encapsulated NiPt, CoPt (NiPt@C, CoPt@C) nanoalloys were synthesized by means of HPCVD starting from sublimating appropriate metal-organic precursors. Structural characterization by means of high resolution transmission electron microscopy, energy dispersive x-ray analysis and X-ray diffraction indicated the formation of coated bimetallic NixPt100-x and CoxPt100-x nanoparticles. Adjusting the sublimation temperature of the different precursors allowed tuning the core sizes with small size distribution. In addition, detailed studies of the magnetic properties are presented. AC magnetic heating studies imply the potential of the coated nanoalloys for hyperthermia therapy.