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MA: Fachverband Magnetismus

MA 8: Magnetic Particles/ Clusters I

MA 8.7: Vortrag

Montag, 14. März 2011, 16:15–16:30, HSZ 103

Studying the effect of particle size and organic capping on magnetic and structural properties of iron oxide nanoparticles by Mössbauer spectroscopy — •Masih Darbandi, Frank Stromberg, Joachim Landers, Carolin Antoniak, Werner Keune, and Heiko Wende — Faculty of Physics and CeNIDE, University of Duisburg-Essen, Germany

Iron oxide nanoparticles have been extensively studied and are attracting growing interest due to their unique intrinsic magnetic properties combined with the nano-size effects. It is well-known that these nanostructured magnetic materials have great potential for many useful applications ranging from information storage and electronic devices to biomedical applications and drug delivery. We have synthesized uniform-sized and crystalline iron oxide nanoparticles in high yield using a microemulsion route at room temperature. Particle size control has been attained by careful adjustment of the preparation conditions. Complementary techniques such as TEM, XRD, SEM were used for the evaluation of their structural and physicochemical properties. A particular effort has been devoted in this work to study the effect of the size and capping of these nanoparticles by Mössbauer spectroscopy at low temperature and with the application of magnetic fields up to 5 T. The sample with the smallest diameter exhibits a markedly different Mössbauer spectrum compared with bigger particles. Most importantly the separation of a surface/volume contribution for the capped nanoparticles with Mössbauer spectroscopy will be reported. Supported by DFG (WE 2623/3-1)