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The Ohio State University

NanoSystems Laboratory

Research Performed at NSL

Atomic Force Microscope

AFM image of the chromatin fiber under denaturing conditions (Xenopus recombinant histone octamers reconstituted with DNA containing an array of 17 tandem repeats of 177bp long nucleosome positioning DNA sequence) - Marek Simon

Focused Ion Beam/Scanning Electron Microscope

InP nanowire with Au contacts fabricated via e-beam lithography. From D. Ko, L. Fang, F. Yang and E. Johnston-Halperin Pt capped ion beam cross section of ion beam machined nanoholes in SiO2 layer. From S. Parks and E. Johnston-Halperin SEM image of SNAP wires (Pt wires on Si). The second set of wires below the first set of wires can be seen. From S. Parks, K. Li and E. Johnston-Halperin

SQUID Magnetometer

SQUID measurements on a colloidal solution of superparamagnetic magnetite nanoparticles: a) Temperature dependence of the magnetic moment obtained in an applied magnetic field of 0.01 T. The curves obtained with the sample cooled in applied fields of 0.01 and 0 T converge at a temperature of 145 K, thus, indicating the superparamagnetic behavior. b) Field dependence of the sample magnetic moment obtained at 300 and 5 K. The room-temperature (300 K) data demonstrates negligible remnant magnetic moment and coercive field, as expected for a superparamagnetic material; in contrast the low-temperature data demonstrates typical ferromagnetic behavior with a coercive field of approximately 0.025 T. This data was obtained by NSL Staff Member Dr. Camelia M. Selcu and is published in S. Schreiber et al., Small 4(2), 270-278 (2008)