A5072724704- Topological Materials and Phenomena
- 2D Materials and Applications
- Magnetic properties of thin films
- Quantum and electron transport phenomena
- Graphene research and applications
- Molecular Junctions and Nanostructures
- Minerals Flotation and Separation Techniques
- Clay minerals and soil interactions
- Nuclear materials and radiation effects
- Concrete and Cement Materials Research
- Chemical Synthesis and Analysis
- Integrated Circuits and Semiconductor Failure Analysis
- Surface and Thin Film Phenomena
- Chalcogenide Semiconductor Thin Films
- Analytical Chemistry and Sensors
- Ferroelectric and Piezoelectric Materials
- Advancements in Semiconductor Devices and Circuit Design
- Enhanced Oil Recovery Techniques
- Semiconductor materials and devices
- Electrochemical sensors and biosensors
- Advanced biosensing and bioanalysis techniques
- Perovskite Materials and Applications
Universidade Federal de Viçosa
2024-2025
Universidade Federal de Minas Gerais
2020-2023
This study investigates the functionalization of gold-coated magnetoelastic sensors with thionine molecules, focusing on resonance frequency shifts. The process was characterized by using Raman spectroscopy and analyzed via scanning electron microscopy atomic force microscopy, revealing progressive formation molecular clusters over time. Our results demonstrate that longer time leads to saturation surface coverage cluster formation, impacting sensor's Such modifications offer insights into...
MnBi2Te4 is one of the most recent materials that integrates class topological quantum exhibiting insulating properties and magnetic ordering, thus providing opportunity to investigate particular states design novel spintronic devices. The samples were grown on GaAs(100) substrates using molecular beam epitaxy with Bi2Te3, Te Mn as sources. growth was characterized through X-ray diffraction, atomic force microscopy transmission electron microscopy. Topological insulator probed scanning...
Our investigation reveals a groundbreaking discovery of negative inverse orbital Hall effect (IOHE) in Ge thin films. We employed the spin pumping technique where spin-orbital coupled current is injected into films using YIG/Pt(2)/Ge(tGe) and YIG/W(2)/Ge(tGe) heterostructures. Through comprehensive analysis, we observe significant reductions signals generated by coherent (rf-driven) incoherent (thermal-driven) techniques. These are attributed to presence remarkably strong IOHE Ge, showing...
Layered materials can usually grow without strain on top of distinct substrates if the only interaction between them is due to van der Waals forces. In such a scenario it would be expected that heterointerface made up weak bounds not affect overlayed material significantly for several large lattice-mismatched systems. Here we have studied first stages heteroepitaxial growth layered bismuth telluride topological insulator highly oriented pyrolitic graphite (HOPG) by molecular beam epitaxy....
In this work, we explore the intriguing spin-momentum locking phenomenon within Rashba states of antimony (Sb) films. By combining spin pumping with flow an external charge current, reveal topological properties surface in Sb Taking advantage well-defined polarization both spin-momentum-locked currents and spin-pumped currents, demonstrate precise manipulation over direction magnitude resulting charging generated through inverse Rashba-Edelstein effect. This fascinating is attributed to...
Layered materials have attracted significant attention in recent years due to the diverse electronic properties arising from different structural variations. Here, we present angle-resolved photoemission spectroscopy measurements conducted on topological material Sb4Te3. This consists of a composite stacking two distinct materials: three-dimensional (3D) insulator Sb2Te3 and two--dimensional (2D) Sb2. Our combined with density functional theory reveal that behavior exhibited by Sb2 persists,...
The production of controlled doping in two-dimensional semiconductor materials is a challenging issue when introducing these systems into current and future technology. In some compounds, the coexistence distinct crystallographic phases for fixed composition introduces an additional degree complexity synthesis, chemical stability, potential applications. this work, we demonstrate that multiphase
Germanium condensation has proven to be a reliable route for obtaining smoothly graded composition SiGe layers with good reproducibility and reduced defect density. The process is known as crucial tool induce well-defined strain on Si or potential use in semiconductor devices. In this work, we show that starting from low concentration Si0.92Ge0.08 layer grown top of crystalline Si(001) SOI substrates, can reach desirable nonmonotonic interplay in-plane out-of-plane strain. Ge evaluated by...
Self-assembled molecules exhibit key functionalities for the development of novel technologies and applications. Usually, molecular systems that long-range positional order are employed in their pure form. In this work, we observe a combination an amphiphilic molecule, tetradecyl-phosphonic acid (TPA), diphosphonate molecule with similar length, 1,10-decyldiphosphonic (DdPA), induces distinct ordered structures depending on relative volume dilutions used drop coating. Starting from 0.2 mM...
The most relevant characteristic of a topological insulator material is the presence edge/surface states that are protected by bulk topology, and therefore, insensitive to nonmagnetic disorder. However, if such disorder induced magnetic atoms or subjected an external field, time-reversal symmetry expected break down, affecting robustness states. In this work, europium (Eu)-doped bismuth telluride thin films were grown molecular beam epitaxy in order analyze effect small fraction with...