Articolele autorului Catalin Harnagea
Link la profilul stiintific al lui Catalin Harnagea

Complex Oxide Nanostructures by Pulsed Laser Deposition through Nanostencils

We achieved parallel nanoscale patterning of ferroelectric complex oxides by pulsed laser deposition through a nanostencil (i.e., through a pattern of apertures in a thin free-standing membrane). Ordered arrays of nanostructured barium titanate (BaTiO3) were obtained onto different substrates in a single deposition step, at room temperature, replicating accurately the aperture patterns in the stencil membrane. After a postdeposition annealing treatment,

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Non-conventional micro- and nanopatterning techniques for electroceramics

An overview of non-conventional methods being used for micro- and nanopatterning of electroceramics is given, including various top-down and bottom-up approaches. Within the top-down approach, focussed ion beam patterning, electron-beam direct writing, nanoimprint lithography, and other next-generation lithography techniques are considered, whereas several physical and chemical self-patterning routes are described for the bottom-up approach. Also

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Challenges in the analysis of the piezoelectric response (Chapter 2)

(Introduction) The piezoresponse technique is based on the detection of local vibrations of a cantilever induced by a testing AC signal applied between the conductive tip of the scanning force microscope (SFM) and the bottom electrode of a ferroelectric sample. The cantilever vibrations are converted into an electrical signal by the position sensitive detector of the SFM and extracted from the global deflection signal using a standard lock-in technique.

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Possibilities and Limitations of Voltage-modulated Scanning Force Microscopy: Resonances in Contact Mode
Ferroelectric epitaxial nanocrystals obtained by a self-patterning method
Well-ordered arrays of pyramid-shaped ferroelectric BaTiO3 nanostructures
Impact of misfit dislocations on the polarization instability of epitaxial nanostructured ferroelectric perovskites
Local switching properties of dense nanocrystalline BaTiO3 ceramics
Piezoresponse scanning force microscopy: „What quantitative information can we really get out of piezoresponse measurement on ferroelectric thin films”
Contact Resonances in Voltage-Modulated Force Microscopy