1. Christian Doppler Laboratory for Direct-Write Fabrication of 3D Nano-Probes (DEFINE), Institute of Electron Microscopy and Nanoanalysis, Graz University of Technology, Steyrergasse 17, 8010 Graz, Austria
2. Department of Materials Science and Engineering, The University of Tennessee, Knoxville, Tennessee 37996, USA
3. Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
4. Bredesen Center for Interdisciplinary Research, The University of Tennessee, Knoxville, Tennessee 37996, USA
5. Institute of Electron Microscopy and Nanoanalysis, Graz University of Technology, 8010 Graz, Austria
6. Graz Centre for Electron Microscopy, Steyrergasse 17, 8010 Graz, Austria