A5018785171- Magnetic properties of thin films
- Quantum and electron transport phenomena
- Electronic and Structural Properties of Oxides
- Magnetic and transport properties of perovskites and related materials
- Topological Materials and Phenomena
- Physics of Superconductivity and Magnetism
- Advanced Memory and Neural Computing
- Advanced Condensed Matter Physics
- ZnO doping and properties
- Graphene research and applications
- Terahertz technology and applications
- Ferroelectric and Piezoelectric Materials
- Semiconductor Quantum Structures and Devices
- Catalysis and Oxidation Reactions
- Molecular spectroscopy and chirality
- Surface and Thin Film Phenomena
- Diamond and Carbon-based Materials Research
- Atomic and Subatomic Physics Research
- Quantum optics and atomic interactions
- Copper Interconnects and Reliability
- Quantum, superfluid, helium dynamics
- Semiconductor materials and devices
- Magnetic Properties and Applications
- 2D Materials and Applications
- Magnetic Field Sensors Techniques
Spintronique et Technologie des Composants
2018-2024
Commissariat à l'Énergie Atomique et aux Énergies Alternatives
2018-2024
University of Groningen
2023-2024
CEA Grenoble
2018-2024
Centre National de la Recherche Scientifique
2018-2023
Université Grenoble Alpes
2018-2023
Direction de la Recherche Technologique
2022
Institut polytechnique de Grenoble
2020
École Normale Supérieure de Lyon
2019
Osaka University
2018
The magnetic proximity effect can induce a spin dependent exchange shift in the band structure of graphene. This produces magnetization and polarization electron/hole carriers this material, paving way for its use as an active component spintronics devices. electrostatic control graphene has however never been demonstrated so far. We show that interfacing with van der Waals antiferromagnet CrSBr results unconventional manifestation quantum Hall effect, which be attributed to presence...
Spintronic structures are extensively investigated for their spin–orbit torque properties, required magnetic commutation functionalities. Current progress in these materials is dependent on the interface engineering optimization of spin transmission. Here, we advance analysis ultrafast spin-charge conversion phenomena at ferromagnetic-transition metal interfaces due to inverse spin-Hall effect properties. In particular, intrinsic Pt-based systems and extrinsic Au:W Au:Ta NiFe/Au:(W,Ta)...
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....
Orbital currents and accumulation provide a new avenue to boost spintronic effects in nanodevices. Here, we use interconversion between charge current orbital angular momentum demonstrate dramatic increase the magnon spin injection detection efficiencies nanodevices consisting of magnetic insulator contacted by $\mathrm{Pt}/{\mathrm{CuO}}_{\mathrm{x}}$ electrodes. Moreover, note distinct variations efficiency for detection, indicating disparity direct inverse Rashba-Edelstein effect efficiencies.
We present measurements of pure spin current absorption on lateral valves. By varying the width absorber we demonstrate that enable one to characterize efficiently transport properties ferromagnetic elements. The analytical model used describe measurement takes into account polarization absorber. analysis thus allows determination and diffusion length a studied material independently, contrary most experiments based valves where those values are entangled. report parameters some important...
Abstract Driving a spin‐logic circuit requires the production of large output signal by spin‐charge interconversion in spin‐orbit readout devices. This should be possible using topological insulators, which are known for their high efficiency. However, high‐quality insulators have so far only been obtained on small scale, or with scale deposition techniques that not compatible conventional industrial processes. The nanopatterning and electrical spin injection into these materials also proven...
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...
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...
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...
Spin-orbit effects appearing in topological insulators (TI) and at Rashba interfaces are currently revolutionizing how we can manipulate spins have led to several newly discovered effects, from spin-charge interconversion spin-orbit torques novel magnetoresistance phenomena. In particular, a puzzling has been evidenced as bilinear electric magnetic fields. Here, report the observation of (BMR) strained HgTe, prototypical TI. We show that both amplitude sign this BMR be tuned by controlling...
We measure the spin-charge interconversion by spin Hall effect in various ferromagnetic/Pt nanodevices. The extracted effective angles of Pt evolve drastically with ferromagnetic (FM) materials (CoFe, Co, and NiFe), when assuming transparent interfaces a bulk origin injection/detection FM elements. By carefully estimating interface resistance, we show that it is quite large cannot be neglected. then evidence at FM/Pt are dominated polarization interfaces. interfacial asymmetric scattering...
The spin absorption process in a ferromagnetic material depends on the orientation relativelyto magnetization. Using ferromagnet to absorb pure current created within lateralspin-valve, we evidence and quantify sizeable dependence of inCo, CoFe NiFe. These experiments allow determining spin-mixing conductance, an elusivebut fundamental parameter spin-dependent transport. We show that obtained valuescannot be understood model considering only Larmor, transverse decoherence spindiffusion...
Large spin Hall angles have been observed in $3d$ ferromagnets, but their origin, and especially link with the ferromagnetic order, remain unclear. Here, we investigate evolution of inverse effect ${\mathrm{Ni}}_{60}{\mathrm{Cu}}_{40}$ ${\mathrm{Ni}}_{50}{\mathrm{Cu}}_{50}$ across Curie temperatures using spin-pumping experiments. We show that these samples is comparable to platinum, it insensitive magnetic order. These results point toward a Heisenberg localized model transition suggest...
We report a new approach to generate and detect spin currents by exploiting the interplay between spin-orbit effects ferroelectricity, in two classes of materials: two-Dimensional Electron Gases (2DEGS) appearing at oxides surfaces or interfaces [1], ferroelectric Rashba semiconductors [2]. While spintronics has traditionally relied on ferromagnetic metals as generators detectors, efficient spin-charge interconversion enabled coupling non-magnetic systems drawn considerable interest recent...
Spin pumping by ferromagnetic resonance is one of the most common technique to determine spin hall angles, Edelstein lengths or diffusion a large variety materials. In recent years, rising concerns have appeared regarding interpretation these experiments, underlining that signal could arise purely from thermoelectric effects, rather than coherent pumping. Here, we propose method evaluate presence absence thermal effects in signals, combining bolometry and measurements, comparing their...
We present the analysis of spin signals obtained in NiFe based metallic lateral valves. exploit dependent diffusive equations both conventional 1D analytic modeling as well 3D Finite Element Method simulations. Both approaches are used for extracting diffusion length $l_{sf}^{N}$ and effective polarization $P_{eff}$ Py/Al, Py/Cu Py/Au nano-structures at $300\,K$ $77\,K$. simulations give consistent results. Combination models provides a powerful tool reliable transport characterization all...
We report the observation of Hanle effect in giant magnetoresistance measurement metallic lateral nanostructures. By applying magnetic fields perpendicularly to magnetization electrodes, we obtain resistance values lower than that parallel state, due extra decoherence provided by random propagation time carriers. An analytical model is developed, enabling us extract characteristic transport parameters CoFe, Al, and Cu from fitting experimental results. compare obtained standard non-local...
Thin layers of Bi2Sr2CaCu2O8+δ (Bi2212) were fabricated using the mechanical exfoliation technique. Good electrical contacts to thin Bi2212 films with low contact resistance realized by depositing Ag and Au electrodes onto annealing them an oxygen flow at 350 °C for 30 min. We observed cross-section images film device a transmission electron microscope characterize diffusion atoms into film.
The spin-dependent transport properties of paramagnetic metals are roughly invariant under rotation. By contrast, in ferromagnetic materials the magnetization breaks rotational symmetry, and thus spin Hall effect is expected to become anisotropic. Here, using a specific design lateral valves, we measure electrically Effect anisotropy NiCu NiPd, both their phases. We show that appearance order does not lead sizeable charge interconversion these materials.
We demonstrate the nonreciprocity of electrically and thermally generated incoherent magnon transport using magnetization direction a Py wire placed on top an ultrathin YIG film. show that properties magnons under depend relative orientation between temperature gradient Py-magnetization direction. The symmetries this nonreciprocal match with those predicted by remote dipolar interaction magnons, controlled chirality stray fields. also directional generation spin Seebeck effect from displays...
<title>Abstract</title> The magnetic proximity effect can induce a spin dependent exchange shift in the band structure of graphene. This produces magnetization and polarization electron/hole carriers this material, paving way for its use as an active component spintronics devices. electrostatic control graphene has however never been demonstrated so far. We show that interfacing with van der Waals antiferromagnet CrSBr results unconventional manifestation quantum Hall effect, which be...
This work reports remanent electric-control of spin-orbit torques (SOT) in a perpendicular ferromagnet-SrTiO3 system. Non-volatile the sheet resistance is achieved with 1150% contrast, and two resistivity states. A SOT efficiency demonstrated using second harmonic Hall methods, sign inversion anti-damping-like effective field. These results are consistent combination both intrinsic modulation extrinsic due to non-volatile current injection 2DEG. The control field evidenced by reproducible...