A5013057580- Electron and X-Ray Spectroscopy Techniques
- Electronic and Structural Properties of Oxides
- X-ray Spectroscopy and Fluorescence Analysis
- Semiconductor materials and devices
- ZnO doping and properties
- Magnetic and transport properties of perovskites and related materials
- Multiferroics and related materials
- Magnetic properties of thin films
- X-ray Diffraction in Crystallography
- Iron oxide chemistry and applications
- Magnetic Properties and Synthesis of Ferrites
- Advanced Memory and Neural Computing
- Advancements in Photolithography Techniques
- Copper-based nanomaterials and applications
- Graphene research and applications
- 2D Materials and Applications
- Semiconductor materials and interfaces
- Advanced Condensed Matter Physics
- Quantum Dots Synthesis And Properties
- Metal-Organic Frameworks: Synthesis and Applications
- Transition Metal Oxide Nanomaterials
- Advancements in Battery Materials
- Crystallization and Solubility Studies
- Machine Learning in Materials Science
- Ferroelectric and Piezoelectric Materials
Instituto de Ciencia de Materiales de Madrid
2015-2024
Consejo Superior de Investigaciones Científicas
2014-2024
European Synchrotron Radiation Facility
2014-2024
European Science Foundation
2008-2024
Sandia National Laboratories
2020-2021
CEA Grenoble
2019
Direct evidence for charge leakage at the interface of epitaxial SrTiO3/LaMnO3 superlattices with atomically sharp interfaces is provided. The direction can be reversed by changing LMO/STO thickness ratio. This result will important understanding some reported limitations oxide devices involving manganite/titanate interfaces.
A plethora of technological applications justify why titanium dioxide is probably the most studied oxide, and an optimal exploitation its properties quite frequently requires a controlled modification surface. Low-energy ion bombardment one extended techniques for this purpose has been recently used in oxides, among other applications, to favour resistive switching mechanisms or form transparent conductive layers. Surfaces modified way are described as reduced defective, with high density...
Defective few-layered graphene mesostructures (DFLGMs) are produced from graphite flakes by high-energy milling processes. We obtain an accurate control of the generated mesostructures, as well amount and classification structural defects formed, providing a functional material for microwave absorption purposes. Working under far-field conditions, competitive values minimum reflection loss coefficient (RLmin) = -21.76 dB EAB 4.77 achieved when DFLGMs immersed in paints at low volume fraction...
This contribution discusses the results of an in situ X-ray photoelectron spectroscopy study thermal evolution native oxide layer on Nb3Sn and pure Nb. (XPS) data were recorded with conventional spectrometers using Al Kα source for spectra collected up to 600 °C a Mg temperatures above °C. The effect thickness, composition, stability that is relevant understanding functional properties superconducting radiofrequency (SRF) cavities used particle accelerators. There consensus plays role...
[Gd(MeCOO)(PhCOO) 2 ], a 2D MOF is reported and characterized, the material shows magnetocaloric effect both in bulk chemisorbed on Silicon substrate. This opens up possibilities for on-surface cooling devices.
Spinel ferrites exhibit significant promise in photocatalysis and other applications due to their compositional diversity favourable electronic structure, magnetism, partially tuneable cation distribution (inversion degree). However, complex...
The oxidation and corrosion of copper are fundamental issues studied for many decades due to their ubiquitous transversal impact. However, the used as catalyst graphene synthesis has opened a singular problem not yet solved. Contradictory results reported about protecting or enhancing role in oxidation. We study short- long-term with different characteristics, such oxygen content morphology, without graphene, polycrystalline foils almost totally textured (100) (111) films on MgO sapphire...
We study the electronic structure of well-characterized epitaxial films FeO (wustite), $\ensuremath{\gamma}\ensuremath{-}{\mathrm{Fe}}_{2}{\mathrm{O}}_{3}$ (maghemite), and ${\mathrm{Fe}}_{3}{\mathrm{O}}_{4}$ (magnetite) using hard x-ray photoelectron spectroscopy (HAXPES), absorption near-edge (XANES), electron energy loss (EELS). carry out HAXPES with incident photon energies 12 15 keV in order to probe bulk-sensitive Fe $1s$ $2p$ core level spectra. $K$-edge XANES is used characterize...
Chemical solution methods for thin-film deposition constitute an affordable alternative to high-vacuum physical technologies, like Sputtering, Pulsed Laser Deposition (PLD) or Molecular Beam Epitaxy (MBE).
SiO2 constitutes one of the most widely used dielectric materials in microelectronics, packaging, and optical industries. Therefore, development new processes to deposit at low temperature an affordable scalable way are desirable. In this work, we present a low-temperature, open-air process based on spatial atomic layer deposition (SALD) that yields high purity films temperatures down room temperature. The were obtained by operating our SALD system CVD mode (i.e., allowing precursor...
Abstract Scalable fabrication of magnetic 2D materials and heterostructures constitutes a crucial step for scaling down current spintronic devices the development novel applications. Here, we report on van der Waals (vdW) epitaxy layered metal Fe 3 GeTe 2 (FGT)—a crystal with highly tunable properties high prospect room temperature ferromagnetism (FM)—directly graphene by employing molecular beam epitaxy. Morphological structural characterization confirmed realization large-area, continuous...
Epsilon iron oxide (ε-Fe2O3) coatings on Si(100) substrates are obtained by an easy one-pot sol-gel recipe assisted glycerol in acid medium. Glycerol, given its small dimensions, enables the formation of ε-Fe2O3 nanoparticles with a size few nanometers and highest purity is reached after densification treatment at 960 °C. The structural compositional evolution up to 1200 °C studied confocal Raman microscopy X-ray absorption spectroscopy techniques, correlating existing magnetic properties....
Abstract Hydrotalcite materials (HTs) were synthesized by a facile and swift combined mechanochemistry/coprecipitation approach, their catalytic activity was evaluated compared with conventionally hydrotalcites (co-precipitation method) in the Knoevenagel condensation between furfural ethyl cyanoacetate/malononitrile. Characterization results clearly demonstrate that proposed mechanochemical/coprecipitation approach provides an improvement crystallinity, morphology, tunable basicity,...
Abstract In the present work, we have determined information depth in a solid for hard X‐ray photoelectron spectroscopy (HAXPES) up to kinetic energy of 15 keV. For that, followed evolution photoemission signal from different core levels gold overlayer grown situ on polycrystalline copper substrate as function energy. We demonstrate that case gold, an 57 nm can be achieved by detecting photoelectrons with 15‐keV The produced at this corresponds 0.2% coming semi‐infinite bulk. Such high...
We have developed an energy analyzer, High Voltage-Cylinder Sector Analyzer 300/15, for electron kinetic energies up to 15 keV. It is especially suited hard x-ray photoelectron spectroscopy, but also ultraviolet and soft spectroscopy (ultraviolet photoemission spectroscopy), Auger reflection high spectroscopy. The analyzer based on a cylinder sector with 90 degrees deflection, 300 mm slit-to-slit distance, four-element pre-retarding lens system 50 sample-to-lens distance. result very compact...
Abstract Ba 0.85 Ca 0.15 Zr 0.1 Ti 0.9 O 3 (BCZT) stands out among lead‐free ferroelectric oxides under consideration to replace state‐of‐the‐art high‐sensitivity piezoelectric Pb(Zr,Ti)O , for a range of energy conversion ceramic technologies. However, the best performances have been reported very coarse‐grained materials, and attempts refine microstructure below 10 µm grain size consistently result in significant property degradation. Here comprehensive study effects on properties BCZT...
We present structural, electronic, and morphological characterization of thin (7.5 nm, 9 unit cells) ultrathin (1.7 2 Fe3O4 layers grown on SrTiO3(001) by oxygen assisted molecular beam epitaxy (MBE) pulsed laser deposition (PLD) methods. The analysis show single-phase single oriented (001) that grow forming a coincidence lattice the order 13. Such an incommensurate growth is for all layers, independent evaporation method layer thickness. magnetite which are strain-free, provide sharp...
We have grown epitaxial incommensurate α-Fe2O3 thin films on α-Al2O3(0001), SrTiO3(111), and LaAlO3(001) substrates, identifying hematite as single iron oxide phase stabilized. demonstrate that a different lattice coupling behavior function of the selected substrate mediates character. Single-oriented α-Fe2O3(0001) layers are obtained α-Al2O3(0001) SrTiO3(111) whereas substrate, layer is found to grow along r-plane adapt its hexagonal cubic evidencing single-oriented (11̅02) layer. In film...