A5007349279- Multiferroics and related materials
- Magnetic properties of thin films
- Ferroelectric and Piezoelectric Materials
- Magnetic and transport properties of perovskites and related materials
- ZnO doping and properties
- Redox biology and oxidative stress
- Advanced Condensed Matter Physics
- Quantum and electron transport phenomena
- Magnetic Field Sensors Techniques
- Theoretical and Computational Physics
- Crystal Structures and Properties
- Advanced Memory and Neural Computing
- Magneto-Optical Properties and Applications
- Physics of Superconductivity and Magnetism
- Solid-state spectroscopy and crystallography
- Photoreceptor and optogenetics research
- Digital Marketing and Social Media
- Liquid Crystal Research Advancements
- Spectroscopy and Laser Applications
- Law and Political Science
- Topological Materials and Phenomena
- Quantum optics and atomic interactions
- Magnetic Properties and Synthesis of Ferrites
- Electron Spin Resonance Studies
- Customer churn and segmentation
Université Paris-Saclay
2020-2024
Centre National de la Recherche Scientifique
2020-2024
Spintronique et Technologie des Composants
2022-2024
Université Grenoble Alpes
2022-2024
Thales (France)
2024
Laboratoire Albert Fert
2020-2023
Commissariat à l'Énergie Atomique et aux Énergies Alternatives
2022-2023
Bavarian Academy of Sciences and Humanities
2018-2023
CEA Grenoble
2022-2023
Technical University of Munich
2018-2020
We investigate the spin Hall magnetoresistance in thin film bilayer heterostructures of heavy metal Pt and antiferromagnetic insulator NiO. While rotating an external magnetic field easy plane NiO, we record longitudinal transverse resistivity layer observe amplitude modulation consistent with magnetoresistance. In comparison to on collinear ferrimagnets, is phase shifted by 90{\deg} its strongly increases magnitude field. explain observed field-dependence a comprehensive model taking into...
Abstract Antiferromagnetic thin films are currently generating considerable excitement for low dissipation magnonics and spintronics. However, while tuneable antiferromagnetic textures form the backbone of functional devices, they virtually unknown at submicron scale. Here we image a wide variety spin in multiferroic BiFeO 3 that can be tuned by strain manipulated electric fields through room-temperature magnetoelectric coupling. Using piezoresponse force microscopy scanning NV magnetometry...
We investigate the spin Hall magnetoresistance (SMR) at room temperature in thin-film heterostructures of antiferromagnetic insulating (0001)-oriented $\ensuremath{\alpha}\text{\ensuremath{-}}{\mathrm{Fe}}_{2}{\mathrm{O}}_{3}$ (hematite) and $\mathrm{Pt}$. measure their longitudinal transverse resistivities while rotating an applied magnetic field up to 17 T three orthogonal planes. For out-of-plane magnetotransport measurements, we find indications for a multidomain configuration whenever...
Magnetic skyrmions are localized chiral spin textures, which offer great promise to store and process information at the nanoscale. In presence of asymmetric exchange interactions, their chirality, governs dynamics, is generally considered as an intrinsic parameter set during sample deposition. this work, we experimentally demonstrate that a gate voltage can control key parameter. We probe chirality domain walls by observing direction current-induced motion show reverse it. This local...
Antiferromagnetic materials promise improved performance for spintronic applications as they are robust against external magnetic field perturbations and allow faster magnetization dynamics compared to ferromagnets. The direct observation of the antiferromagnetic state, however, is challenging due absence a macroscopic magnetization. Here, we show that spin Hall magnetoresistance (SMR) versatile tool probe structure via simple electrical transport experiments by investigating easy-plane...
Abstract Domain switching pathways fundamentally control performance in ferroelectric thin film devices. In epitaxial bismuth ferrite (BiFeO 3 ) films, the domain morphology is known to influence multiferroic orders. While both striped and mosaic domains have been observed, origins of latter remained unclear. Here, it shown that defined by strain profile across film–substrate interface. samples with domains, X‐ray diffraction analysis reveals strong gradients, while geometric phase using...
The resistance of a heavy metal can be modulated by an adjacent magnetic material through the combined effects spin Hall effect, inverse and dissipation accumulation at interface. This phenomenon is known as magnetoresistance. occur via various mechanisms, with spin-transfer torque being most extensively studied. In this work, we report observation magnetoresistance interface between platinum insulating altermagnetic candidate, Ba$_2$CoGe$_2$O$_7$. Our findings reveal that heterostructure...
In ultrathin ferromagnetic films sandwiched between two distinct heavy metal layers or a and an oxide layer, the Dzyaloshinskii-Moriya interaction (DMI) is recognized as being of interfacial origin. Its chirality strength are determined by properties adjacent metals degree oxidation at interfaces. Here, we demonstrate that DMI can change solely with variations in thickness layer - effect has not been experimentally observed explained until now. Our experimental observation trilayer system...
In the room-temperature magnetoelectric multiferroic BiFeO3, noncollinear antiferromagnetic state is coupled to ferroelectric order, opening applications for low-power electric-field-controlled magnetic devices. While several strategies have been explored simplify landscape, here we directly stabilize a single-domain and spin cycloid in epitaxial BiFeO3 (111) thin films grown on orthorhombic DyScO3 (011). Comparing them with SrTiO3 (111), identify anisotropic in-plane strain as powerful...
Understanding how antiferromagnetic spin textures evolve with epitaxial strain and ferroelectric domains in multiferroic BiFeO${}_{3}$ thin films is key for their efficient use as reconfigurable spintronic devices. This study combines local-probe techniques to reveal exotic cycloids diverging periods under large tensile strain. Coupling quantitative measurements analytical calculations of the expected stray magnetic field, authors estimate spin-density-wave amplitude locked cycloid different...
Abstract Topological states are currently gathering intensive investigation in condensed matter physics due to their potential as configurable electronic devices for the future era coined “topotronics.” Beyond numerous breakthroughs magnetism over past decade, a new paradigm is emerging with proposal of topologically protected objects ferroelectric materials. Recently, skyrmions and vortices observed PbTiO 3 /SrTiO superlattices, opening path toward ultra‐small topological low‐power...
Helium implantation in epitaxial thin films is a way to control the out-of-plane deformation independently from in-plane strain controlled by epitaxy. In particular, means of helium microscope allows for local and patterning down nanometer resolution, which interest device applications. We present here study bismuth ferrite (${\mathrm{BiFeO}}_{3}$) where was patterned locally implantation. Our combined Raman, x-ray diffraction, transmission electron microscopy (TEM) shows that causes an...
Miniaturized, ultra-sensitive and easily integrable magnetometers are needed for many applications like space exploration or medical survey. In this study, we combine innovative magnetic tunnel junctions having a symmetric resistance-field (R–H) response with high gain flux concentrator. our junctions, the magnetization of free layer (FL) is stabilized in an anti-parallel configuration respect to that reference layer. This achieved by using soft exchange pinning FL. We precisely adjust field...
The perpendicular magnetic anisotropy (PMA) of metal/ferromagnet (FM)/oxide trilayers is known to depend on the degree oxidation FM/oxide interface. Among different methods tune PMA, magnetoionics emerging as a promising technique with potential applications in low-power spintronic devices. In this work, PMA $\mathrm{Pt}$/$\mathrm{Co}$/${\mathrm{Al}\mathrm{O}}_{x}$/${\mathrm{Hf}\mathrm{O}}_{2}$ capacitorlike devices was gradually tuned by electric field gating. Hard-x-ray photoelectron...
Antiferromagnetic materials promise improved performance for spintronic applications, as they are robust against external magnetic field perturbations and allow faster magnetization dynamics compared to ferromagnets. The direct observation of the antiferromagnetic state, however, is challenging due absence a macroscopic magnetization. We show that spin Hall magnetoresistance (SMR) versatile tool probe structure via simple electrical transport experiments by investigating easy-plane...
Antiferromagnetic thin films are currently generating considerable excitement for low dissipation magnonics and spintronics. However, while tuneable antiferromagnetic textures form the backbone of functional devices, they virtually unknown at submicron scale. Here we image a wide variety spin in multiferroic BiFeO3 that can be tuned by strain manipulated electric fields through room temperature magnetoelectric coupling. Using piezoresponse force microscopy scanning NV magnetometry...
Recommending products that are helpful to customers and tailored their needs is of pivotal importance for successful online retailing. Online purchase data typically used generate such recommendations. This dissertation studies two topic models use make product The Author Topic Model (ATM) Sticky (Sticky ATM) applied the an retailer animal health products, predictive performances contrasted with those benchmark methods Unigram, Bigram, Collaborative Filtering (CF). work focuses on generation...