Orlando Auciello

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Understanding the suppression of ferroelectricity in perovskite thin films is a fundamental issue that has remained unresolved for decades. We report a synchrotron x-ray study of lead titanate as a function of temperature and film thickness for films as thin as a single unit cell. At room temperature, the ferroelectric phase is stable for thicknesses down(More)
Most MEMS devices are currently based on silicon because of the available surface machining technology. However, Si has poor mechanical and tribological properties which makes it difficult to produce high performance Si based MEMS devices that could work reliably, particularly in harsh environments; diamond, as a superhard material with high mechanical(More)
The fracture strength of ultrananocrystalline diamond ͑UNCD͒ has been investigated using tensile testing of freestanding submicron films. Specifically, the fracture strength of UNCD membranes, grown by microwave plasma chemical vapor deposition ͑MPCVD͒, was measured using the membrane deflection experiment developed by Espinosa and co-workers. The data show(More)
—The mechanical properties of ultrananocrys-talline diamond (UNCD) thin films were measured using mi-crocantilever deflection and membrane deflection techniques. Bending tests on several free-standing UNCD cantilevers, 0.5 µm thick, 20 µm wide and 80 µm long, yielded elastic modulus values of 916–959 GPa. The tests showed good re-producibility by repeated(More)
A hard, low-wear probe for contact-mode writing techniques, such as dip-pen nanolithography (DPN), was fabricated using ultrananocrystalline diamond (UNCD). Molding within anisotropically etched and oxidized pyramidal pits in silicon was used to obtain diamond tips with radii down to 30 nm through growth of UNCD films followed by selective etching of the(More)
Surfaces of materials that promote cell adhesion, proliferation, and growth are critical for new generation of implantable biomedical devices. These films should be able to coat complex geometrical shapes very conformally, with smooth surfaces to produce hermetic bioinert protective coatings, or to provide surfaces for cell grafting through appropriate(More)
Precise control of composition and microstructure is critical for the production of (Ba x Sr 1-x)Ti 1+y O 3+z (BST) dielectric thin films with the large dependence of permittivity on electric field, low losses, and high electrical breakdown fields that are required for successful integration of BST into tunable high frequency devices. Here we review recent(More)
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Here we introduce angle-resolved piezoresponse force microscopy ͑AR-PFM͒, whereby the sample is rotated by 30° increments around the surface normal vector and the in-plane PFM phase signals are collected at each angle. We obtained the AR-PFM images of BaTiO 3 single crystal and cube-on-cube epitaxial ͑001͒ BiFeO 3 ͑BFO͒ thin film on SrRuO 3 / SrTiO 3(More)
Dielectric properties of hydrogen-incorporated chemical vapor deposited diamond thin films" (2007). Abstract Diamond thin films with a broad range of microstructures from a ultrananocrystalline diamond (UNCD) form developed at Argonne National Laboratory to a microcrystalline diamond (MCD) form have been grown with different hydrogen percentages in the(More)