A5010114635- Electronic and Structural Properties of Oxides
- Magnetic and transport properties of perovskites and related materials
- Advanced Condensed Matter Physics
- Magnetic properties of thin films
- Multiferroics and related materials
- Semiconductor materials and devices
- Ferroelectric and Piezoelectric Materials
- Magnetic Properties and Synthesis of Ferrites
- ZnO doping and properties
- Physics of Superconductivity and Magnetism
- Quantum and electron transport phenomena
- nanoparticles nucleation surface interactions
- Magnetic Properties and Applications
- Catalysis and Oxidation Reactions
- Metallurgical and Alloy Processes
- Thermodynamic and Structural Properties of Metals and Alloys
- Copper Interconnects and Reliability
- Magnetic Field Sensors Techniques
- Magnetic Properties of Alloys
- Advanced Materials Characterization Techniques
Centre National de la Recherche Scientifique
2019-2024
Université Paris-Saclay
2019-2024
Thales (France)
2024
Laboratoire Albert Fert
2019-2023
Instituto de Cerámica y Vidrio
2020
Université Paris-Sud
2019
The generation of large spin currents, and the associated torques, which are at heart modern spintronics, has long been achieved by charge-to-spin conversion mechanisms, i.e., Hall effect and/or Rashba–Edelstein effect, intrinsically linked to strong spin–orbit coupling. Recently, a novel path predicted observed for achieving significant current-induced torques originating from light elements, hence possessing weak interaction. These findings point out potential involvement orbital...
Oxide interfaces exhibit a broad range of physical effects stemming from broken inversion symmetry. In particular, they can display non-reciprocal phenomena when time reversal symmetry is also broken, e.g., by the application magnetic field. Examples include direct and inverse Edelstein (DEE, IEE) that allow interconversion between spin currents charge currents. The DEE IEE have been investigated in based on perovskite SrTiO3 (STO), albeit separate studies focusing one or other....
Rashba interfaces have emerged as promising platforms for spin-charge interconversion through the direct and inverse Edelstein effects. Notably, oxide-based two-dimensional electron gases display a large gate-tunable conversion efficiency, determined by transport measurements. However, visualization of Rashba-split bands in oxide is lacking, which hampers an advanced understanding their rich spin-orbit physics. Here, we investigate KTaO3 evidence using angle resolved photoemission...
Abstract Spin-orbit torques (SOTs) have opened a novel way to manipulate the magnetization using in-plane current, with great potential for development of fast and low power information technologies. It has been recently shown that two-dimensional electron gases (2DEGs) appearing at oxide interfaces provide highly efficient spin-to-charge current interconversion. The ability 2DEGs gate voltages could offer degree freedom lacking in classical ferromagnetic/spin Hall effect bilayers...
Abstract The Magnetoelectric Spin‐Orbit (MESO) technology aims to bring logic into memory by combining a ferromagnet with magnetoelectric (ME) element for information writing, and spin‐orbit (SO) read‐out through spin‐charge conversion. Among candidate SO materials achieve large MESO output signal, oxide Rashba two‐dimensional electron gases (2DEGs) have shown very conversion efficiencies, albeit mostly in spin‐pumping experiments. Here, all‐electrical spin‐injection experiments nanoscale...
Ferroelectric materials possess electric dipoles adding up to a macroscopic polarization that is switchable by an field. Most ferroelectrics are insulators but some wide bandgap semiconductors doping can be turned into metallic conductors. If restricted thin slab near the material surface, conducting region may harbor two-dimensional electron gas (2DEG). The 2DEG then affected ferroelectric switching, and even retain properties coexisting with behavior. paper Br\'ehin...
Due to the issues associated with rare-earth elements, there arises a strong need for magnets properties between those of ferrites and that could substitute latter in selected applications. Here, we produce high remanent magnetization composite bonded magnet by mixing FeCo nanowire powders hexaferrite particles. In first step, metallic nanowires diameters 30 100 nm length at least 2 μm are fabricated electrodeposition. The oriented as-synthesized show remanence ratios above 0.76 coercivities...
SrTiO$_3$-based two-dimensional electron gases (2DEGs) can be formed through the deposition of epitaxial oxides like LaAlO$_3$ or reactive metals such as Al. Such 2DEGs possess a finite Rashba spin-orbit coupling that has recently been harnessed to interconvert charge and spin currents direct inverse Edelstein Hall effects. Here we compare formation properties generated in SrTiO$_3$ by growth Al, Ta Y ultrathin films magnetron sputtering. By combining situ ex X-ray photoelectron spectroscopy...
Rashba interfaces enable spin-charge interconversion via the direct and inverse Edelstein effects, so may be used to replace ferromagnets as efficient sources detectors of spin. However, direction spins generated by a ferromagnet can easily switched, while that system is usually fixed, being set its electronic structure. This study shows in SrTiO${}_{3}$-based interfaces, where multiple bands contribute differently charge-spin conversion, application gate voltage enables sign change...
Abstract The mechanism of the gate-field-induced metal-to-insulator transition electrons at interface SrTiO 3 with LaAlO or AlO x is great current interest. Here, we show infrared ellipsometry and confocal Raman spectroscopy that an important role played by a polar lattice distortion non-collinear, highly asymmetric hysteretic respect to gate field. anomalous behavior large lateral component underlying local electric field explained in terms interplay between oxygen vacancies, tend migrate...
Abstract The versatility of properties displayed by two‐dimensional electron gases (2DEGs) at oxide interfaces has fostered intense research in hope achieving exotic electromagnetic effects confined systems. Of particular interest is the recently discovered superconducting state appearing (111)‐oriented KTaO 3 interfaces, with a critical temperature T c ≈2 K, almost 10 times higher than that SrTiO ‐based 2DEGs. Just as 2DEGs, fabricating devices this new system technical challenge due to...
Two-dimensional electron gases (2DEGs) based on KTaO3 are emerging as a promising platform for spin-orbitronics due to their high Rashba spin–orbit coupling (SOC) and gate-voltage tunability. The recent discovery of superconducting state in 2DEGs now expands potential towards topological superconductivity. Although the band structure surfaces various crystallographic orientations has already been mapped using angle-resolved photoemission spectroscopy (ARPES), this is not case 2DEGs. Here, we...
Perpendicular magnetic anisotropy (PMA) and Dzyaloshinskii-Moriya interactions are key in modern spintronics. These thought to be dominated by the oxidation of Co|Al interface archetypal Platinum-Cobalt-Aluminum oxide system. Here, we observe a double sign change about threefold variation interfacial chiral interaction, influenced not only oxidation, but also metallic Al thickness. Contrary previous assumptions negligible spin-orbit effects at light metal interfaces, strong PMA with fully...
The recent discovery of superconductivity in infinite-layer (IL, ABO$_2$) nickelates has opened a new avenue to deepen the understanding high-temperature superconductivity. However, progress this field is slowed by significant challenges material synthesis and scarcity research groups capable producing high quality superconducting samples. IL are obtained from reduction perovskite ABO$_3$ phase, typically achieved annealing using CaH$_2$ as reducing agent. Here, we present method synthesize...
Rashba interfaces have emerged as promising platforms for spin-charge interconversion through the direct and inverse Edelstein effects. Notably, oxide-based two-dimensional electron gases (2DEGs) display a large gate-tunable conversion efficiency, determined by transport measurements. However, visualization of Rashba-split bands in oxide 2DEGs is lacking, which hampers an advanced understanding their rich spin-orbit physics. Here, we investigate KTaO$_3$-2DEGs evidence using angle resolved...
The Magnetoelectric Spin-Orbit (MESO) technology aims to bring logic into memory by combining a ferromagnet with magnetoelectric (ME) element for information writing, and spin-orbit (SO) read-out through spin-charge conversion. Among candidate SO materials achieve large MESO output signal, oxide Rashba two-dimensional electron gases (2DEGs) have shown very conversion efficiencies, albeit mostly in spin-pumping experiments. Here, we report all-electrical spin-injection experiments nanoscale...
The linear magnetoelectric effect (ME) is the phenomenon by which an electric field produces a magnetization. Its observation requires both time-reversal and space-inversion symmetries to be broken, as in multiferroics. While ME has only been studied insulating materials, it can actually exist non-centrosymmetric conductors such two-dimensional electron gases (2DEGs) with Rashba spin-orbit coupling. It then coined Edelstein (EE), bias voltage -- generating charge current transverse spin...
Two-dimensional electron gases(2DEGs)based on KTaO3 are emerging as a promising platform for spin-orbitronics due to their high Rashba spin-orbit coupling (SOC) and gate-voltage tunability. The recent discovery of superconducting state in 2DEGs now expands potential towards topological superconductivity. Although the band structure surfaces various crystallographic orientations has already been mapped using angle-resolved photoemission spectroscopy(ARPES), this is not case 2DEGs. Here, we...
The versatility of properties displayed by two-dimensional electron gases (2DEGs) at oxide interfaces has fostered intense research in hope achieving exotic electromagnetic effects confined systems. Of particular interest is the recently discovered superconducting state appearing (111)-oriented KTaO$_3$ interfaces, with a critical temperature $T_c \approx 2$ K, almost ten times higher than that SrTiO$_3$-based 2DEGs. Just as 2DEGs, fabricating devices this new system technical challenge due...
Spin-orbit torques (SOTs) have opened a novel way to manipulate the magnetization using in-plane current, with great potential for development of fast and low power information technologies. It has been recently shown that two-dimensional electron gases (2DEGs) appearing at oxide interfaces provide highly efficient spin-to-charge current interconversion. The ability 2DEGs gate voltages could offer degree freedom lacking in classical ferromagnetic/spin Hall effect bilayers spin-orbitronics,...