Development of Variable Temperature NMR Force Microscopy

ORAL

Abstract

We report our progress on the construction of a variable temperature NMR force microscopy probe and the development of its control system for three dimensional nanoscale scanning. The probe contains two 3-axis piezo-driven slip-stick motion stages for fiber interferometer and for gradient magnet positioning. The control station is a LabView software based control system capable to perform signal generation and data acquisition. Preliminary scan position dependent NMR Force measurements on ammonium sulfate (NH$_{4})_{2}$SO$_{4}$ were performed at room temperature in a sample-on-oscillator configuration. Both piezo-driven and thermal noise cantilever motion have been analyzed to determine resonant frequencies $\omega _{c}$, quality factor Q, and spring constants k; a typical cantilever yielded $\omega _c =1494.40\pm 0.10$Hz, $k=0.039\pm 0.004N/m$, $Q=93.$ RF frequency-modulation-driven artifact effects have been observed and measured during analysis.

*We acknowledge support from DMR-0605828 and Welch F-1191

–

Authors

  • Isaac V. Manzanera Esteve

    • Department of Physics, University of Texas
    • The University of Texas at Austin, Department of Physics
    • University of Texas. Physics Department

  • John T. Markert

    • Department of Physics, University of Texas
    • The University of Texas at Austin, Department of Physics
    • University of Texas. Physics Department
    • Department of Physics, The University of Texas at Austin