NIRT: Building Nanospintronic and Nanomagnetic Structures:

1. NIRT: Building Nanospintronic and Nanomagnetic Structures: Growth, Manipulation, and Characterization at the Atomic Scale DMR-0304314. Arthur R. Smith, Saw-Wai Hla, Nancy Sandler, and Sergio Ulloa, Ohio University, Athens, OH-45701. Self-Assembled Molecular Cluster of TBPPBr-Co on Gallium Nitride Molecular self-assembly is the key process for the bottom-up approach of nanoscience. We have successfully formed a self-assembled molecular layer (SAM) of TBPPBr-Co on GaN(000-1) surface at low temperatures and probed its local electronic properties using tunneling spectroscopy. Since the TBPPBr-Co molecule includes a spin-active Co atom, this SAM formation allows a uniform 2-D spin lattice on a wide band gap semiconductor surface for the first time. This achievement may open novel applications in spintronic device development. A STM image of a self assembled molecular layer of TBPPBr-Co on GaN (000-1) (left), a molecule model (middle), and a STM image showing preferential positioning of molecules (right).

2. Kondo Impurity on surface: NRG spectral density Surface features & effects in STM conductance curves NIRT: Building Nanospintronic and Nanomagnetic Structures: Growth, Manipulation, and Characterization at the Atomic Scale DMR-0304314. Arthur R. Smith, Saw-Wai Hla, Nancy Sandler, and Sergio Ulloa, Ohio University, Athens, OH-45701. Surface and bulk variations in the electronic density of states result in different Kondo signatures, reflected in the spectral densities …  …which in turn result in drastically distinct differential conductance signatures and Fano line shapes measured by STM probes

3. NIRT: Building Nanospintronic and Nanomagnetic Structures: Growth, Manipulation, and Characterization at the Atomic Scale DMR-0304314. Arthur R. Smith, Saw-Wai Hla, Nancy Sandler, and Sergio Ulloa, Ohio University, Athens, OH-45701. K-12 School VisitsSergio Ulloa, NIRT theorist, speaks to a group of SE Ohio high-school students about nanoscience, in one of several K-12 visits of the NIRT group this last year. Of this visit, the teacher said “I have nothing but positive feedback from my students.” K-12 Nanoscience Essay Contest Seventh-grader – Mr. Isaac J. Smith, of Athens (blue shirt) won the nsnm nanoscience essay contest. Here he is shown on a field trip to the nanoscience labs at Ohio University with his teacher (far right), his Dad (far left), and Dr. Sandler. Science Writers in Training Undergraduates Suzanne Wilder (left) and Lauren Van Arsdale (right) pose in front of their poster describing the nanoscience writing program, which they presented at the first Ohio Nanotechnology Summit. The 2 science writers wrote articles about the Summit, which was held March 2-3, 2005 in Dayton, Ohio.