Browsing by Author "Lederman, D."
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- ItemComparative study of the structural and optical properties of epitaxial CuFeO2 and CuFe(1-x)GaxO(2) delafossite thin films grown by pulsed laser deposition methods(2017) Wheatley, Robert Alastair; Rojas de la Fuente, Susana Dennis; Oppolzer, C.; Joshi, T.; Borisov, P.; Lederman, D.; Cabrera, Alejandro Leopoldo
- ItemMagnetooptic Properties of Fe/Pd and Co/Pd Bilayers Under Hydrogen Absorption(2004) Lederman, D.; Volkmann, Ulrich; Cabrera, Alejandro Leopoldo
- ItemModification of ferroelectric hysteresis in Pb(Nb,Zr,Ti)O3 thin films induced by CO2 adsorption(2011) Ramos-Moore, E.; Lederman, D.; Cabrera, A. L.We report on the modification of ferroelectric hysteresis in Pb(Nb,Zr,Ti)O-3 thin films under the adsorption of CO2 gas. The samples were exposed to the gas in ultra high vacuum while different voltages between the top (Ag) and bottom (Pt) electrodes were applied. After dosing, the samples were heated from room temperature at 1.8 K/s, and a mass spectrometer was used to detect the desorbed molecules. The effective molecular sticking was demonstrated by the appearance of the carbon Auger peak in the surface of the sample and by the presence of CO2 in the desorption curves. After +(-) 9.9 V were applied to the bottom electrode during dosing, we found a shift of 0.52 (+0.58) mu C/cm(2) in the remnant polarization. These evidences suggest the existence of a depolarizing field induced by molecular adsorption at the surface of the top electrode, and contribute to highlight the potential use of ferroelectric thin films as gas sensors. (C) 2011 Elsevier B.V. All rights reserved.
- ItemModification of ferroelectric hysteresis in Pb(Nb,Zr,Ti)O3 thin films induced by CO2 adsorption(2011) Ramos-Moore, E.; Lederman, D.; Cabrera, A. L.We report on the modification of ferroelectric hysteresis in Pb(Nb,Zr,Ti)O(3) thin films under the adsorption of CO(2) gas. The samples were exposed to the gas in ultra high vacuum while different voltages between the top (Ag) and bottom (Pt) electrodes were applied. After dosing, the samples were heated from room temperature at 1.8 K/s, and a mass spectrometer was used to detect the desorbed molecules. The effective molecular sticking was demonstrated by the appearance of the carbon Auger peak in the surface of the sample and by the presence of CO(2) in the desorption curves. After +((-)) 9.9 V were applied to the bottom electrode during dosing, we found a shift of -0.52 (+0.58) mu C/cm(2) in the remnant polarization. These evidences suggest the existence of a depolarizing field induced by molecular adsorption at the surface of the top electrode, and contribute to highlight the potential use of ferroelectric thin films as gas sensors. (C) 2011 Elsevier B. V. All rights reserved.
- ItemModification of the Chemisorption Properties of Epitaxial Delafossite CuFeO2 Thin Films by Substituting Fe for Ga in the Crystal Structure(2018) Rojas, S.; Joshi, T.; Wang, Q.; Holcomb, Mikel B.; Lederman, D.; Cabrera, Alejandro Leopoldo
- ItemOptical detection of carbon dioxide adsorption on epitaxial CuFe1-xGaxO2 Delafossite film grown by pulse laser deposition(2016) Rojas de la Fuente, Susana Dennis; Joshi, T.; Wheatley, Robert Alastair; Sarabia Vallejos, Mauricio; Borisov, P.; Lederman, D.; Cabrera, Alejandro Leopoldo
- ItemOptical properties of Pd thin films exposed to hydrogen studied by transmittance and reflectance spectroscopy(2010) Ávila Osses, Jonathan Israel; Matelon, R. J.; Trabol Duarte, Ricardo Alexsis; Favre Domínguez, Mario; Lederman, D.; Volkmann, Ulrich; Cabrera, Alejandro Leopoldo
- ItemRaman and x-ray photoelectron spectroscopy study of ferroelectric switching in Pb(Nb,Zr,Ti)O 3 thin films(2012) Ramos Moore, Esteban; Ferrari Ramírez, Piero Antonio; Díaz Droguett, Donovan Enrique; Lederman, D.; Evans, J.T.