Dresden 2014 – scientific programme

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MA: Fachverband Magnetismus

MA 19: Poster I

MA 19.40: Poster

Tuesday, April 1, 2014, 13:00–15:30, P1

The influence of the magnetic field on the dynamics of the Goethite nanoplates probed by X-ray Photon Correlation Spectroscopy — •Alexander Schavkan, Fabian Westermeier, Alexey Zozulya, Birgit Fischer, Alessandro Ricci, Martin Schroer, Michael Sprung, and Gerhard Grübel — DESY Deutsches Elektronen-Synchrotron, Hamburg, Deutschland

Recent research on nano-particles led to significant advances on the development of new materials. Lately, experiments on the externally controlled behaviour of "smart nanoparticles" were of particular interest. These particles can be controlled by changing environmental conditions. The straight forward attempt is to investigate the behaviour of the particles during changes of the parameter, which they are sensitive to.

The outstanding magnetic properties of the different phases of Goethite are well studied. Still no approach was done to investigate the dynamics of the phases of Goethite suspensions and their transitions under applied magnetic field with XPCS. In the described experiment we synthesized Goethite suspensions with different concentrations. The underlying dynamics of these suspensions were probed by XPCS. First we measured the dynamics of the suspensions without magnetic field. In the second part we applied different types of the magnetic fields: permanent one, which was induced by the permanent magnet and non-permanent, which was created by a custom magnetic chamber. The influence of the applied magnetic field and the changes of the field on the dynamics of the suspensions were studied.