Dresden 2020 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 7: Micro- and Nanostructured Materials (joint session MA/TT)

TT 7.6: Vortrag

Montag, 16. März 2020, 10:45–11:00, HSZ 403

Strain induced orientation of hematite nanospindles studied via Mössbauer spectroscopy — •Damian Günzing1, Julian Seifert2, Samira Webers1, Joachim Landers1, Annette M. Schmidt2, and Heiko Wende11Faculty of Physics and Center for Nanointegration Duisburg-Essen (CENIDE), University of Duisburg-Essen — 2Department of Chemistry, Institute of Physical Chemistry, University of Cologne

Magnetic nanoparticles embedded in different matrices are a promising hybrid material class with the opportunity of tayloring the magneto-elastic properties. For an efficiently working hybrid material, it is mandatory to understand the particle matrix interaction on the nanoscale. In this work spatial particle ordering of anisotropic hematite nanospindels [1] is induced via applied strain to an elastomer matrix with incorporated particles. To study the ordering process the focus lies on the element specific Mössbauer spectroscopy with and without an applied magnetic field. With this technique we obtain information about the spin orientation and Brownian diffusion simultaneously from the measured spectra. The distributions in spin orientation are further compared to Monte-Carlo simulations calculating the degree of ordering. As a complementary method, small angle x-ray scattering measurements are performed on the sample systems to determine the ordering parameter from the spatial particle distribution. This work is financially supported by the DFG priority program SPP1681 (WE2623/7-3).

[1] J. Landers et al., J. Phys. Chem. C 119, 20642-20648 (2015)

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