Descrizione del modulo "MD.P03.009.001 Ottica e spettroscopia nell'intervallo spettrale UV-X soffici (MD.P03.009.002)"

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  • Descrizione del modulo "MD.P03.009.001 Ottica e spettroscopia nell'intervallo spettrale UV-X soffici (MD.P03.009.002)" (literal)
Potenziale impiego per bisogni individuali e collettivi
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Tematiche di ricerca
  • OxideMBE Growth of epitaxial transition metal oxide thin films with perovskite structure via oxide molecular beam epitaxy and study of their basic electronic, magnetic and transport properties. Results will be also exploited in the construction of prototype innovative spintronic devices. TIOF Thin films, from basic science to technology. Depth profile of electronic /magnetic structure and atomic geometry through films interior and at (buried) interfaces at macro-nano-atomic scale. Optical spectroscopy (scattering, specular and diffuse, polarimetry) in vis-SoftX and simulation are main tools. Systems and research lines: fluorides nano heterostruct.; confined liquid crystalline polymers, atactic polystyrene, thiols,organic interfaces (e.g. Ru/Si, Mo/Si, Co/Mg, Manganites/STO); related bulk materials as rare earths and manganites. SIPE Linear optical techniques XAS, PES, IPES applied to nanostructured systems NanoS: surfaces, organic-inorganic and solid-solid interfaces. Effect of morphology on interface electronic properties. Non-linear spectroscopy applied to model systems. Instrumental developments related to optical techniques (literal)
Competenze
  • Growth of complex oxides by MBE Electrical characterization of thin film Spectroscopy of bulk and low dimensional materials. Spectroscopies include optical spectroscopies (specular reflectivity, diffuse scattering, absorption, luminescence, fluorescence) and electron spectroscopy (photoemission, Auger, inverse photoemission) Surface and interface preparation in UHV (literal)
Potenziale impiego per processi produttivi
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Tecnologie
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Obiettivi
  • OxideMBE Optimisation of epitaxial growth procedures of complex oxide heterostructures for basic knowledge and fabrication of prototype spintronic devices. Extension of the results obtained on manganite films to new multiferroic materials. Improvement of the efficiency of tunneling magnetoresistance effect in the construction of spin valve heterostructures. TIOF *Modelling of molecular orientation, layering, depth-dependent dielectric constant and interface molecular arrangement of organic confined materials * Magnetic and concentration profiles at (buried) interfaces *Knowledge of ultrathin dielectric films ( fluorides) to promote controlled growth of materials as magnetically ordered inorganic nanostructures or organic thin films *Determination of optical constants of strained oxides (e.g. SrTiO3) *Implementation of polarimetric setups in reflectivity and transmission in the VIS-SoftX photon range SIPE Correlation between long range order and electronic (even magnetic) properties on NanoS. Energy levels alignment, ground (IPES) and excited states (XAS, ResPES) of NanoS related to new studies of dynamics obtained by applying t-resolved techniques (ps and fs resolution) us (literal)
Stato dell'arte
  • OxideMBE The capability of growing atomic controlled crystalline epitaxial oxide heterostructures via molecular beam epitaxy with an in situ detailed monitoring of the growth conditions through reflection high-energy electron diffraction was proven to be a crucial point of strenght. The concentration of the elemental species can be controlled with the spatial resolution of one unit cell. TIOF In depth dependence of electronic, magnetic and structural properties of films, both organic and inorganic, are important problems for basic science and applications. Optical spectroscopy in combination with a suitable modelling is proven to be a powerful tool for these kind of investigations. SIPE SIPE lab is operative, ƒ´E=260 meV, electron beam collimation 2¢X. Commissioning of portable IPES lab for complementary optical techniques studies at beamlines. Structure of interfaces by NEXAFS and S-XRD (ESRF). Band structure and chemistry of oxides (TiO2), porphyrinoids-metals and their structure. (literal)
Tecniche di indagine
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