Filters

20141

More filters

20201
Reset filters

Settings

Author: Buchwald, J. Ă— DDC: 530 Ă— Has files: Yes Ă— Subject: Nanostructures Ă— WGL Institute: IOM Ă—

Search Results

Now showing 1 - 1 of 1
  • Thumbnail Image
    Item
    Nanometer-resolved mechanical properties around GaN crystal surface steps
    (Frankfurt, M. : Beilstein-Institut zur Förderung der Chemischen Wissenschaften, 2014) Buchwald, J.; Sarmanova, M.; Rauschenbach, B.; Mayr, S.G.
    The mechanical properties of surfaces and nanostructures deviate from their bulk counterparts due to surface stress and reduced dimensionality. Experimental indentation-based techniques present the challenge of measuring these effects, while avoiding artifacts caused by the measurement technique itself. We performed a molecular dynamics study to investigate the mechanical properties of a GaN step of only a few lattice constants step height and scrutinized its applicability to indentation experiments using a finite element approach (FEM). We show that the breakdown of half-space symmetry leads to an "artificial" reduction of the elastic properties of comparable lateral dimensions which overlays the effect of surface stress. Contact resonance atomic force microscopy (CR-AFM) was used to compare the simulation results with experiments.