Dresden 2009 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 31: Magnetic Particles and Clusters I

MA 31.10: Vortrag

Donnerstag, 26. März 2009, 12:30–12:45, HSZ 401

Fe nanoparticles embedded in MgO crystals — •Artem Shalimov¹, Kay Potzger¹, Dorin Geiger², Hannes Lichte², Georg Talut¹, Andrzej Misiuk³, Helfried Reuther¹, Frank Stromberg⁴, Shengqiang Zhou¹, Carsten Baehtz¹, and Jürgen Fassbender¹ — ¹Forschungszentrum Dresden-Rossendorf, Bautzner Landstraße 128, 01328 Dresden — ²Technical University, Dresden, Germany — ³Institute of Electron Technology, Warsaw, Poland — ⁴Universität Duisburg-Essen, Germany

Iron nanoparticles embedded in MgO crystals were synthesized by Fe+ ion implantation at an energy of 100 keV and varying fluences from 3*10E16 to 3*10E17 cm-2. Investigations of structural and magnetic properties of Fe nanoparticles have been performed using magnetometry, x-ray diffraction, transmission electron microscopy and Mössbauer spectroscopy, as well as by theoretical Preisach modeling of bistable magnetic systems. It has been found that alpha- and gamma-Fe nanoparticles are formed for all fluences. The content of the alpha- Fe phase increases at higher fluences and after annealing. The influence of post implantation annealing at 800 C in vacuum and under enhanced up to 10 kbar hydrostatic pressure in argon atmosphere on the formation of nanoparticles has been analyzed. Investigations have been performed within DFG project PO1275/2-1 "SEMAN".