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.
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Authors
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Isaac V. Manzanera Esteve
Department of Physics, University of Texas, The University of Texas at Austin, Department of Physics, University of Texas. Physics Department
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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