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Broadband Impedance Microscopy for Research on Complex Quantum Materials

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Technical Report,01 Aug 2014,31 Jul 2015

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University of Texas at Austin Austin United States

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The DURIP program Broadband Impedance Microscopy for Research on Complex Quantum Materials supported by ARO has been successfully completed by the PIs group. By customizing the equipment purchased through this award, we have demonstrated the broadband impedance imaging with a spatial resolution better than 100 nm and a capacitance sensitivity better than 10 aF over 7 orders of magnitude in frequency from 1 kHz to 10 GHz, as specified in the initially proposed program. In particular, exciting results were obtained to locally resolve the collective vibration of ferroelectric domain walls, which manifests itself as a frequency-dependent dielectric loss in the MHz- GHz regime. With the combined capability of dielectric spectroscopy and impedance microscopy, we expect to gain tremendous knowledge on complex quantum materials for their applications in the next-generation acoustic, electronic, and optic devices, all of which crucial for Defense purposes.

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