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Lecture

WEB Magnetic field-assisted CVD: the role of d-electrons

Friday (25.09.2020)
13:20 - 13:35 P: Processing and Synthesis 1
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External electric and magnetic fields offer additional control over material formation in broad range of processing techniques, ranging from sintering to CVD and thereby covering the whole dimension from nano- to micrometer sized growth effects. For the latter, the role of electric fields was shown to change film morphologies in aerosol assisted CVD, while hot filament CVD of iron nanostructures showed anisotropic structure growth along the applied magnetic field lines. Starting there, we developed a custom-made magnetic field assisted CVD reactor (mfCVD) which allows us to study magnetic transition metal (oxide) growth (e. g. iron, magnetite) from single-source precursor molecules. Depending on the chosen precursor and magnetic field strength and orientation, we observed changes in phase, morphology and magnetic anisotropy, as demonstrated by SEM, XRD and VSM, respectively. Finally, spectromicroscopy (X-PEEM, XMCD) revealed changes in the electronic structure of e.g. iron oxide films from mfCVD with superior homogeneity, if compared to the zero field counterpart.

Speaker:
Daniel Stadler
University of Cologne
Additional Authors:
  • Dr. David N. Mueller
    Research Centre Jülich GmbH
  • Dr. Tomáš Duchoň
    Research Centre Jülich GmbH
  • Dr. Thomas Fischer
    University of Cologne
  • Prof. Dr. Sanjay Mathur
    University of Cologne