A5068518072- Magnetic properties of thin films
- Magnetic Properties and Applications
- Multiferroics and related materials
- Theoretical and Computational Physics
- Magnetic Properties of Alloys
- Microstructure and Mechanical Properties of Steels
- Magneto-Optical Properties and Applications
- Electron and X-Ray Spectroscopy Techniques
- Copper Interconnects and Reliability
- Magnetic and transport properties of perovskites and related materials
- Metamaterials and Metasurfaces Applications
- Photonic and Optical Devices
- Metallic Glasses and Amorphous Alloys
- Physics of Superconductivity and Magnetism
- Ferroelectric and Piezoelectric Materials
- Advanced Materials Characterization Techniques
- Metallurgical and Alloy Processes
- Catalytic Processes in Materials Science
- Metal and Thin Film Mechanics
- Underwater Acoustics Research
- Surface and Thin Film Phenomena
- Advanced Measurement and Metrology Techniques
- Advanced Optical Sensing Technologies
- Shape Memory Alloy Transformations
- Semiconductor Lasers and Optical Devices
Université de Bretagne Occidentale
2013-2025
Laboratoire des Sciences et Techniques de l’Information de la Communication et de la Connaissance
2023
Centre National de la Recherche Scientifique
2001-2016
Université Européenne de Bretagne
2010
Laboratoire Traitement du Signal et de l'Image
2005
Université Jean Monnet
2002
Institut de Physique et Chimie des Matériaux de Strasbourg
1992-2001
Developing functional materials for optical remote control of magnetism can lead to faster, more efficient wireless data storage and sensing devices. In terms desired material properties, this development requires the combined optimization elastic interactions, low magnetic coercivity, a narrow linewidth ferromagnetic resonance establish low-loss dynamic functionalities. A general pathway achieve these requirements is still lacking. Here, we demonstrate that rare-earth trace element doping...
Magnetoelectric composites are an important class of multiferroic materials that pave the way towards a new generation multifunctional devices directly integrable in data storage technology and spintronics. This study focuses on strain-mediated electrical manipulation magnetization extrinsic multiferroic. The composite includes 5 nm or 60 Fe$_{81}$Ga$_{19}$ thin films coupled to piezoelectric (011)-PMN-PZT. reversal reveals converse magnetoelectric coefficient $\alpha_\mathrm{CME,max}...
$M\phantom{\rule{0}{0ex}}a\phantom{\rule{0}{0ex}}g\phantom{\rule{0}{0ex}}n\phantom{\rule{0}{0ex}}e\phantom{\rule{0}{0ex}}t\phantom{\rule{0}{0ex}}o\phantom{\rule{0}{0ex}}s\phantom{\rule{0}{0ex}}t\phantom{\rule{0}{0ex}}r\phantom{\rule{0}{0ex}}i\phantom{\rule{0}{0ex}}c\phantom{\rule{0}{0ex}}t\phantom{\rule{0}{0ex}}i\phantom{\rule{0}{0ex}}o\phantom{\rule{0}{0ex}}n$ is a key property used in devices such as sensors, actuators, and energy harvesters, particularly spintronics straintronics. Here...
A comparative study of the structure and magnetotransport properties Co/Ru sandwiches grown by evaporation in ultrahigh vacuum (UHV) plasma sputtering is reported. The crystalline both types samples has been studied x-ray diffraction transmission electron microscopy interfacial morphology nuclear magnetic resonance. comparison shows that main structural difference comes from quality: evaporated are single crystals whereas sputtered polycrystalline not textured. This no significant effect on...
We report on experimental evidence of exchange bias between a polycrystalline antiferromagnetic BiFeO3 and ferromagnetic Ni81Fe19 film at room temperature. The measured 17 Oe hysteresis loop shift corresponds to an energy 11×10-3 erg/cm2 per unit area the interface coupling two films, which is comparable with those observed for similar epitaxially-grown systems. azimuthal behavior longitudinal transverse magnetization components revealed presence induced unidirectional biquadratic...
Magnetization reversal processes of Permalloy exchange coupled with thin polycrystalline antiferromagnetic multiferroic BiFeO3 films were investigated. The critical thickness and the interfacial energy are comparable similar epitaxially grown systems. However, coercive field dependence on presents an atypical behaviour. This system shows induced unidirectional, uniaxial, biquadratic-like behaviour misalignment magnetic easy axis respect to pinning direction.
Abstract Using strain to control magnetic properties through anisotropy changes is a method create functional materials with energy efficient applications. The can be inferred remotely by the light-induced non-thermal dimension change of named photostrictive effect. Still, dynamic via this effect pursued. need physical quantity encompass and describe anisotropic magnetization under also remaining. Here, visible light used engineer static in multiferroic material. A converse...
The effect of multiaxial mechanical stress on angle-dependent magnetization reversals is studied a single 10-nm ${\mathrm{Ni}}_{80}{\mathrm{Fe}}_{20}$ film, ${\mathrm{Fe}}_{81}{\mathrm{Ga}}_{19}$ and ${\mathrm{Ni}}_{80}{\mathrm{Fe}}_{20}$(10 nm)/${\mathrm{Fe}}_{81}{\mathrm{Ga}}_{19}$(10 nm) bilayer. These films are grown flexible $\mathrm{Al}$ ``kitchenlike'' foils. foils bent two convex optical lenses to apply stresses different magnitudes. In order understand the mechanisms driving...
A novel monolithically integrated device used as an optical phase-shift detector is presented. It consists of a diffraction grating etched at the surface p-n photodiode fabricated by process compatible with standard silicon CMOS technology. When two coherent light beams are collimated toward device, detected power generates current depending on relative phase between incident beams. The operating principle this and results obtained finite-difference time-domain modeling fabrication first...
A temperature-dependent coherent magnetization reversal model is proposed for size-distributed assemblies of ferromagnetic nanoparticles (NPs). NPs are assumed to be uniaxial and cubic anisotropies. The thermal dependence included by considering fluctuations, implemented through the Néel-Arrhenius theory. Theoretically calculated angular dependences loops obtained. There similar behaviors a single NP an assembly NPs. In particular, it shown that fourfold anisotropy results in double slope...
Magnetic and magnetostrictive hysteresis loops of TbCo/CoFe multilayers under field applied along the hard magnetization axis are studied using vectorial measurements, optical deflectometry magneto Kerr microscopy. Even a very small angle misalignment between magnetic direction is shown to drastically change shape torsion loops. Two kinds domains revealed during magnetization: big regions with opposite rotation spontaneous vector which appear in narrow interval provide an inversion this...