A5102937942- Magnetic properties of thin films
- Electronic and Structural Properties of Oxides
- Quantum and electron transport phenomena
- Electrocatalysts for Energy Conversion
- Physics of Superconductivity and Magnetism
- Surface and Thin Film Phenomena
- Magnetic Properties and Applications
- Electrochemical Analysis and Applications
- Machine Learning in Materials Science
- Semiconductor materials and devices
- X-ray Diffraction in Crystallography
- Analytical chemistry methods development
- Geophysical and Geoelectrical Methods
- Advanced Photocatalysis Techniques
- Metallic Glasses and Amorphous Alloys
- Semiconductor materials and interfaces
- Gas Sensing Nanomaterials and Sensors
- Crystallization and Solubility Studies
- nanoparticles nucleation surface interactions
- Quantum, superfluid, helium dynamics
- Transition Metal Oxide Nanomaterials
- Seismic Waves and Analysis
- Magnetic and transport properties of perovskites and related materials
- Semiconductor Quantum Structures and Devices
- ZnO doping and properties
Universidad Autónoma de Madrid
2010-2018
Cornell University
2013-2016
Universidad Complutense de Madrid
2006-2012
Johns Hopkins University
2008
A major goal of energy research is to use visible light cleave water directly, without an applied voltage, into hydrogen and oxygen. Although SrTiO3 requires ultraviolet light, after four decades, it still the "gold standard" for photo-catalytic splitting water. It chemically robust can carry out both oxygen evolution reactions bias. While ultrahigh vacuum surface science techniques have provided useful insights, we know relatively little about structure these electrodes in contact with...
We have investigated the magnetotransport properties of ultrathin films Bi grown on thermally oxidized Si(001) substrates with thickness ranging from 10 to 100 nm at temperatures down 2 K and in magnetic fields up 90 kOe. Remarkable differences both temperature field dependence Hall resistivity are found for above below 20 nm. These observations can be explained due presence surface states, which play an important role determining electronic transport thinnest films. The estimated carrier...
We study the electrical resistivity of individual Bi nanowires diameter 100 nm fabricated by electrodeposition using a four-probe method in temperature range 5–300 K with magnetic fields up to 90 kOe. Low-resistance Ohmic contacts are achieved focused ion beam deposit W-based nanocontacts. Magnetoresistance measurements show evidence for weak antilocalization at temperatures below 10 K, phase-breaking length nm.
We report here the observation of ferromagnetism (FM) at 300 K in mixtures ${\text{TiO}}_{2}$ and ${\text{Co}}_{3}{\text{O}}_{4}$ powders despite antiferromagnetic diamagnetic characters both oxides, respectively. The ferromagnetic behavior is found early stages reaction only for anatase structure; no FM identical samples prepared with rutile-${\text{TiO}}_{2}$. Optical spectroscopy x-ray absorption spectra confirm a surface reduction octahedral...
Bismuth is a semimetal with unusual transport properties, such as long mean free path and large magnetoresistance (MR) effect. Here we report on the influence of deposition potential, Bi(III) concentration, thickness microstructure morphology bismuth thin films. Polycrystalline films were deposited gold from nitrate solution. The texture strongly dependent potential but only weakly film thickness. as-deposited was highly grain size. Understanding structure−property relationships an important...
The Stark broadening parameters of 17 lines Ni II have been measured in a plasma produced by ablation an Al–Ni alloy with Nd:YAG laser. were obtained the target placed molecular argon at 6 Torr, which provides appropriate measurement conditions. A Boltzmann plot was used to obtain temperature (16 500 ± 2100 K) and published values Al electron density ((1.07 0.10)1017cm−3); these values, composition determined means Saha equation. local thermodynamic equilibrium condition checked....
High quality, epitaxial thin-films are key components of almost all modern electronic devices. During deposition, lattice mismatch between the substrate and film generates elastic strain. The strain energy grows with thickness until a defect is generated that relieves relaxation mechanism critical in electrodeposition. Here, we study how metal (bismuth) growing via electrodeposition on semiconductor [GaAs(110)] relaxes mismatch-induced Using situ synchrotron-based X-ray techniques, monitor...
A major goal of energy research is to use visible light cleave water directly, without an applied voltage, into hydrogen and oxygen. Since the initial reports ultraviolet (UV) activity TiO2 SrTiO3 in 1970s, researchers have pursued a fundamental understanding mechanistic molecular-level phenomena involved photo-catalysis. Although it requires UV light, after four decades still gold standard for splitting water. It chemically stable catalyzes both oxygen reactions bias. While ultrahigh vacuum...
The magnetic properties of CoP electrodeposited alloys can be easily controlled by layering the and modulating P content different layers using pulse plating in electrodeposition process. However, because its amorphous nature, study interface quality, which is a limitation for optimization soft these alloys, becomes complex task. In this work, we use Rutherford backscattering spectroscopy (RBS) to determine that Co0.74P0.26/Co0.83P0.17 multilayers with down 20 nm-thick are composed...
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