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1. Modeling of Several Concentric Layers of Superconducting Filaments

Author

Frédéric Bouillault, Thitipong Satiramatekul, Laboratoire de génie électrique de Paris (LGEP), Université Paris-Sud - Paris 11 (UP11)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Ecole Supérieure d'Electricité - SUPELEC (FRANCE)-Centre National de la Recherche Scientifique (CNRS), ICHAMS - Equipe Interaction Champs - Matériaux et Structures, and Université Paris-Sud - Paris 11 (UP11)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Ecole Supérieure d'Electricité - SUPELEC (FRANCE)-Centre National de la Recherche Scientifique (CNRS)-Université Paris-Sud - Paris 11 (UP11)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Ecole Supérieure d'Electricité - SUPELEC (FRANCE)-Centre National de la Recherche Scientifique (CNRS)

Subjects
[PHYS]Physics [physics], 010302 applied physics, Superconductivity, Resistive touchscreen, Materials science, Large Hadron Collider, Condensed matter physics, Superconducting electric machine, Superconducting magnet, Superconducting magnetic energy storage, 01 natural sciences, Electronic, Optical and Magnetic Materials, law.invention, law, Condensed Matter::Superconductivity, Magnet, 0103 physical sciences, Electrical and Electronic Engineering, 010306 general physics, ComputingMilieux_MISCELLANEOUS, Decoupling (electronics)
Abstract

LGEP 2014 ID = 1513; International audience; The knowledge of superconducting filaments magnetization is an important issue of the LHC main magnets design during the construction at CERN. A new method for modeling a superconducting strand, which consists of several concentric layers of the filaments, is proposed in this paper. The numerical results obtained using the finite-element method demonstrate the coupling and decoupling behaviors between the superconducting filaments via the resistive matrix. The comparison with the earlier work on the superconductor modeling is presented and discussed.

Published
2014
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2. Effective Permittivity of Shielding Composite Materials for Microwave Frequencies

Author

Laurent Daniel, Romain Corcolle, Valentin Préault, Lionel Pichon, ICHAMS - Equipe Interaction Champs - Matériaux et Structures, Laboratoire de génie électrique de Paris (LGEP), Université Paris-Sud - Paris 11 (UP11)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Ecole Supérieure d'Electricité - SUPELEC (FRANCE)-Centre National de la Recherche Scientifique (CNRS)-Université Paris-Sud - Paris 11 (UP11)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Ecole Supérieure d'Electricité - SUPELEC (FRANCE)-Centre National de la Recherche Scientifique (CNRS), and Université Paris-Sud - Paris 11 (UP11)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Ecole Supérieure d'Electricité - SUPELEC (FRANCE)-Centre National de la Recherche Scientifique (CNRS)

Subjects
010302 applied physics, Permittivity, Materials science, Electromagnetic compatibility, 020206 networking & telecommunications, 02 engineering and technology, Condensed Matter Physics, Microstructure, 01 natural sciences, Homogenization (chemistry), Atomic and Molecular Physics, and Optics, Wavelength, Homogeneous, 0103 physical sciences, Electromagnetic shielding, 0202 electrical engineering, electronic engineering, information engineering, Electrical and Electronic Engineering, Composite material, Microwave
Abstract

International audience; Due to mass constraints, composite materials are possible candidates to replace metal alloys for electromagnetic shielding applications. The design of standard metallic shielding enclosures often relies on finite-element calculations. But in the case of composite materials, the strong dependence on the shielding properties to the microstructure makes the finite-element approach almost impossible. Indeed meshing the microstructure would imply a huge number of elements, incompatible with usual computational resources. We propose in this paper to develop homogenization tools to define the effective electromagnetic properties of composite materials at microwave frequencies. The ratio between the characteristic size of the microstructure and the wavelength is shown to be a key parameter in the homogenization process. The effective properties can then be used as an input for electromagnetic compatibility standard tools, designed for homogeneous media.

Published
2013
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3. Shielding Effectiveness of Composite Materials: Effect of Inclusion Shape

Author

Romain Corcolle, Valentin Préault, Lionel Pichon, Laurent Daniel, ICHAMS - Equipe Interaction Champs - Matériaux et Structures, Laboratoire de génie électrique de Paris (LGEP), Université Paris-Sud - Paris 11 (UP11)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Ecole Supérieure d'Electricité - SUPELEC (FRANCE)-Centre National de la Recherche Scientifique (CNRS)-Université Paris-Sud - Paris 11 (UP11)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Ecole Supérieure d'Electricité - SUPELEC (FRANCE)-Centre National de la Recherche Scientifique (CNRS), and Université Paris-Sud - Paris 11 (UP11)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Ecole Supérieure d'Electricité - SUPELEC (FRANCE)-Centre National de la Recherche Scientifique (CNRS)

Subjects
010302 applied physics, Electromagnetic field, Computer science, business.industry, Electromagnetic compatibility, 020206 networking & telecommunications, 02 engineering and technology, Microstructure, 01 natural sciences, Homogenization (chemistry), Electronic, Optical and Magnetic Materials, 0103 physical sciences, Electromagnetic shielding, 0202 electrical engineering, electronic engineering, information engineering, Electrical and Electronic Engineering, Composite material, Aerospace, business, Electrical conductor, Quasistatic process, Microwave
Abstract

International audience; The use of composite materials for electromagnetic shielding applications contributes to the effort of structure lightening in aerospace industry. In these materials the strong interaction between the electromagnetic field and the microstructure makes the standard numerical tools difficult to implement. Indeed these methods would involve an excessive number of degrees of freedom to describe details of the microstructure. An efficient way to overcome this problem is the use of homogenization techniques providing the effective properties of heterogeneous materials. These effective properties can then be introduced in standard numerical tools to estimate the behavior of shielding enclosures. A recent paper proposes an extension to microwave frequencies of quasistatic homogenization methods. It introduces a characteristic length for the microstructure in the case of a square array of circular 2-D conductive phases embedded in a dielectric matrix. In this paper, a method to identify this length parameter is proposed for random microstructures.

Published
2013
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4. An Analytical Model for the Effect of Multiaxial Stress on the Magnetic Susceptibility of Ferromagnetic Materials

Author

Laurent Daniel, Laboratoire de génie électrique de Paris (LGEP), Université Paris-Sud - Paris 11 (UP11)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Ecole Supérieure d'Electricité - SUPELEC (FRANCE)-Centre National de la Recherche Scientifique (CNRS), ICHAMS - Equipe Interaction Champs - Matériaux et Structures, and Université Paris-Sud - Paris 11 (UP11)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Ecole Supérieure d'Electricité - SUPELEC (FRANCE)-Centre National de la Recherche Scientifique (CNRS)-Université Paris-Sud - Paris 11 (UP11)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Ecole Supérieure d'Electricité - SUPELEC (FRANCE)-Centre National de la Recherche Scientifique (CNRS)

Subjects
010302 applied physics, Materials science, 02 engineering and technology, Physics::Classical Physics, 021001 nanoscience & nanotechnology, 01 natural sciences, Magnetic susceptibility, Electronic, Optical and Magnetic Materials, Stress (mechanics), Equivalent stress, Ferromagnetism, Permeability (electromagnetism), 0103 physical sciences, Electromagnetic devices, Electrical and Electronic Engineering, Composite material, 0210 nano-technology
Abstract

International audience; The magnetic permeability of magnetic materials highly depends on mechanical stress. Stress state is usually multiaxial and has a significant effect on the performance of electromagnetic devices. In this paper a three-parameter analytical model for the stress dependent permeability of magnetic materials is proposed, based on a simplified energetic description of magneto-elastic behaviour. The proposed approach also provides a new equivalent stress for magnetic behaviour in the low-field and low-stress regime.

Published
2013
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5. 3D modeling of forces between magnet and HTS in a levitation system using new approach of the control volume method based on an unstructured grid

Author

J. Lévêque, Lotfi Alloui, S.M. Mimoune, Frédéric Bouillault, Laurent Bernard, Laboratoire de génie électrique de Paris (LGEP), Université Paris-Sud - Paris 11 (UP11)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Ecole Supérieure d'Electricité - SUPELEC (FRANCE)-Centre National de la Recherche Scientifique (CNRS), ICHAMS - Equipe Interaction Champs - Matériaux et Structures, Université Paris-Sud - Paris 11 (UP11)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Ecole Supérieure d'Electricité - SUPELEC (FRANCE)-Centre National de la Recherche Scientifique (CNRS)-Université Paris-Sud - Paris 11 (UP11)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Ecole Supérieure d'Electricité - SUPELEC (FRANCE)-Centre National de la Recherche Scientifique (CNRS), and COCODI - Equipe Conception, Commande et Diagnostic

Subjects
010302 applied physics, Physics, business.industry, Energy Engineering and Power Technology, Relaxation (iterative method), Mechanical engineering, Condensed Matter Physics, 3D modeling, 01 natural sciences, Control volume, Electronic, Optical and Magnetic Materials, Unstructured grid, Classical mechanics, Creep, Magnet, 0103 physical sciences, Levitation, Electrical and Electronic Engineering, 010306 general physics, business, Magnetic levitation
Abstract

International audience; In this paper we present new 3D numerical model to calculate the vertical and the guidance forces in high temperature superconductors taking into account the influence of the flux creep phenomena. In the suggested numerical model, we adopt a new approach of the control volume method. This approach is based on the use of an unstructured grid which can be used to model more complex geometries. A comparison of the control volume method results with experiments verifies the validity of this approach and the proposed numerical model. Based on this model, the levitation force's relaxation at different temperatures was also studied.

Published
2012
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6. Ultrafast and low-power terahertz wave modulator based on organic photonic crystal

Author

Jiu-sheng Li, Said Zouhdi, Laboratoire de génie électrique de Paris (LGEP), Université Paris-Sud - Paris 11 (UP11)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Ecole Supérieure d'Electricité - SUPELEC (FRANCE)-Centre National de la Recherche Scientifique (CNRS), ICHAMS - Equipe Interaction Champs - Matériaux et Structures, and Université Paris-Sud - Paris 11 (UP11)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Ecole Supérieure d'Electricité - SUPELEC (FRANCE)-Centre National de la Recherche Scientifique (CNRS)-Université Paris-Sud - Paris 11 (UP11)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Ecole Supérieure d'Electricité - SUPELEC (FRANCE)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Materials science, Extinction ratio, Terahertz radiation, business.industry, Physics::Optics, 02 engineering and technology, 021001 nanoscience & nanotechnology, 01 natural sciences, Atomic and Molecular Physics, and Optics, Electronic, Optical and Magnetic Materials, Intensity (physics), 010309 optics, Quality (physics), Optics, Picosecond, 0103 physical sciences, Insertion loss, Optoelectronics, Electrical and Electronic Engineering, Physical and Theoretical Chemistry, 0210 nano-technology, business, Ultrashort pulse, Photonic crystal
Abstract

International audience; We theoretically investigate the modulation efficiency, response time, and pump power of a terahertz-beam intensity modulator by using an organic photonic crystal slab structure with high quality factor "defect" cavity. The basic operation of an ultrafast low-power terahertz wave modulator actuated by the dynamical shifts of the defect mode induced by pump intensity is discussed in detail. The finite-difference time-domain method is used to verify and analyze the characteristics of the terahertz wave modulator. The device exhibited extinction ratio of 47.15 dB and insertion loss of 3.2 dB at frequency of 1.062 THz with ultrafast response times on the order of several picoseconds.

Published
2012
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7. Influence of Speed Variation of a Transverse Magnetic Field on a Magnetization of HTS Cylinder

Author

Denis Netter, Bruno Douine, Smail Mezani, Abelin Kameni, Jean Lévêque, ICHAMS - Equipe Interaction Champs - Matériaux et Structures, Laboratoire de génie électrique de Paris (LGEP), Université Paris-Sud - Paris 11 (UP11)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Ecole Supérieure d'Electricité - SUPELEC (FRANCE)-Centre National de la Recherche Scientifique (CNRS)-Université Paris-Sud - Paris 11 (UP11)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Ecole Supérieure d'Electricité - SUPELEC (FRANCE)-Centre National de la Recherche Scientifique (CNRS), Groupe de Recherche en Electrotechnique et Electronique de Nancy (GREEN), Université de Lorraine (UL), and Université Paris-Sud - Paris 11 (UP11)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Ecole Supérieure d'Electricité - SUPELEC (FRANCE)-Centre National de la Recherche Scientifique (CNRS)

Subjects
010302 applied physics, Physics, Magnetic domain, Condensed matter physics, Magnetic energy, [SPI.NRJ]Engineering Sciences [physics]/Electric power, Demagnetizing field, Condensed Matter Physics, 01 natural sciences, Electronic, Optical and Magnetic Materials, [PHYS.COND.CM-S]Physics [physics]/Condensed Matter [cond-mat]/Superconductivity [cond-mat.supr-con], [SPI.ELEC]Engineering Sciences [physics]/Electromagnetism, Magnetization, Magnetic anisotropy, Remanence, 0103 physical sciences, Magnetic pressure, Electrical and Electronic Engineering, Single domain, 010306 general physics
Abstract

LGEP 2011 ID = 952; International audience; In this paper, we numerically study the influence of the speed variation of a magnetic source on the distribution of current density, magnetization, and dissipated energy of a high-temperature superconducting cylinder described by a Jn power law. The results presented come from the resolution of a nonlinear diffusion problem of electric field by a mixed finite-element finite-volume discretization method. This method is robust, stable, and converges for large values of n. The calculations carried out for n, varying from 1 to 200, show that when the external magnetic field quickly varies from 0 to its maximal value, the maximum values of penetration, the magnetization, and the energy dissipation are obtained when the switching of magnetic field occurs. For a periodic magnetic field, we note that any change of the period results in variation of the magnetization and the dissipated energy.

Published
2011
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8. Energetical and multiscale approaches for the definition of an equivalent stress for magneto-elastic couplings

Author

Olivier Hubert, Laurent Daniel, Laboratoire de Mécanique et Technologie (LMT), École normale supérieure - Cachan (ENS Cachan)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de génie électrique de Paris (LGEP), Université Paris-Sud - Paris 11 (UP11)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Ecole Supérieure d'Electricité - SUPELEC (FRANCE)-Centre National de la Recherche Scientifique (CNRS), ICHAMS - Equipe Interaction Champs - Matériaux et Structures, Université Paris-Sud - Paris 11 (UP11)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Ecole Supérieure d'Electricité - SUPELEC (FRANCE)-Centre National de la Recherche Scientifique (CNRS)-Université Paris-Sud - Paris 11 (UP11)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Ecole Supérieure d'Electricité - SUPELEC (FRANCE)-Centre National de la Recherche Scientifique (CNRS), and Centre National de la Recherche Scientifique (CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC)-École normale supérieure - Cachan (ENS Cachan)

Subjects
010302 applied physics, Physics, Magnetic domain, Constitutive equation, Isotropy, 02 engineering and technology, Mechanics, 021001 nanoscience & nanotechnology, Condensed Matter Physics, Orthotropic material, 01 natural sciences, Electronic, Optical and Magnetic Materials, Stress (mechanics), 0103 physical sciences, Stress measures, Hydrostatic stress, 0210 nano-technology, Plane stress
Abstract

LGEP 2011 ID = 842; International audience; A main limitation of most models describing the effect of stress on the magnetic behavior is that they are restricted to uniaxial - tensile or compressive - stress. Nevertheless, stress is multiaxial in most of industrial applications. An idea to overcome the strong limitation of models is to define a fictive uniaxial stress, the equivalentstress, that would change the magnetic behavior in a similar manner than a multiaxial stress. A first definition of equivalentstress, called the deviatoric equivalentstress, is proposed. It is based on an equivalence in magneto-elastic energy. This formulation is first derived for isotropic materials under specific assumptions. An extension to orthotropic media under disoriented magneto-mechanical loading is made. A new equivalentstress expression, called generalized equivalentstress, is then proposed. It is based on an equivalence in magnetization. Inverse identification of equivalentstress is made possible thanks to a strong simplification of the description of the material seen as an assembly of elementary magnetic domains. It is shown that this second proposal is a generalization of the deviatoric expression. Equivalentstress proposals are compared to former proposals and validated using experimental results carried out on an iron-cobalt sheet submitted to biaxial mechanical loading. These results are compared to the predictions obtained thanks to the equivalentstress formulations. The generalized equivalentstress is shown to be a tool able to foresee the magnetic behavior of a large panel of materials submitted to multiaxial stress.

Published
2011
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9. Reconstruction of faulty wiring networks using reflectometry response and genetic algorithms

Author

Lionel Pichon, Mostafa Kamel Smail, Fabrice Auzanneau, Marc Lambert, Marc Olivas, ICHAMS - Equipe Interaction Champs - Matériaux et Structures, Laboratoire de génie électrique de Paris (LGEP), Université Paris-Sud - Paris 11 (UP11)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Ecole Supérieure d'Electricité - SUPELEC (FRANCE)-Centre National de la Recherche Scientifique (CNRS)-Université Paris-Sud - Paris 11 (UP11)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Ecole Supérieure d'Electricité - SUPELEC (FRANCE)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Fiabilisation des Systèmes Embarqués (LFSE), Laboratoire d'Intégration des Systèmes et des Technologies (LIST), Direction de Recherche Technologique (CEA) (DRT (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Direction de Recherche Technologique (CEA) (DRT (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA), DRE - Département de Recherche en Electromagnétisme, EMG - Département Electromagnétisme - L2S, Laboratoire des signaux et systèmes (L2S), Université Paris-Sud - Paris 11 (UP11)-CentraleSupélec-Centre National de la Recherche Scientifique (CNRS)-Université Paris-Sud - Paris 11 (UP11)-CentraleSupélec-Centre National de la Recherche Scientifique (CNRS)-SUPELEC-Campus Gif, Ecole Supérieure d'Electricité - SUPELEC (FRANCE)-Ecole Supérieure d'Electricité - SUPELEC (FRANCE), Université Paris-Sud - Paris 11 (UP11)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Ecole Supérieure d'Electricité - SUPELEC (FRANCE)-Centre National de la Recherche Scientifique (CNRS), and Laboratoire d'Intégration des Systèmes et des Technologies (LIST (CEA))

Subjects
Engineering, reconstruction, time domain reflectometry, 02 engineering and technology, 01 natural sciences, Wiring network, Genetic algorithm, genetic algorithm, 0202 electrical engineering, electronic engineering, information engineering, Electronic engineering, Electrical and Electronic Engineering, Reflectometry, business.industry, Mechanical Engineering, 010401 analytical chemistry, Finite-difference time-domain method, faults, 020206 networking & telecommunications, Inverse problem, Condensed Matter Physics, Reconstruction method, 0104 chemical sciences, Electronic, Optical and Magnetic Materials, [SPI.ELEC]Engineering Sciences [physics]/Electromagnetism, Mechanics of Materials, Simulated data, FDTD method, business, Algorithm
Abstract

International audience; A novel technique is developed to reconstruct faulty wiring networks and/or to localize the defects affecting the branches of the wiring network from the reflectometry response. The direct problem (propagation in the cables) is modelled by RLCG circuit model and the Finite Difference Time Domain (FDTD) method whereas the inverse problem is solved using Genetic Algorithms (GAs). In a first step the forward problems is validated by comparison with experimental and simulated data and in a second step the proposed reconstruction method is applied on different configurations and the results are discussed.

Published
2011
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10. Fano Resonance Filtering Characteristic of High-Resistivity Silicon Photonic Crystal Slab in Terahertz Region

Author

Jiu-sheng Li, Said Zouhdi, ICHAMS - Equipe Interaction Champs - Matériaux et Structures, Laboratoire de génie électrique de Paris (LGEP), Université Paris-Sud - Paris 11 (UP11)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Ecole Supérieure d'Electricité - SUPELEC (FRANCE)-Centre National de la Recherche Scientifique (CNRS)-Université Paris-Sud - Paris 11 (UP11)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Ecole Supérieure d'Electricité - SUPELEC (FRANCE)-Centre National de la Recherche Scientifique (CNRS), and Université Paris-Sud - Paris 11 (UP11)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Ecole Supérieure d'Electricité - SUPELEC (FRANCE)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Silicon photonics, Materials science, Condensed matter physics, business.industry, Terahertz radiation, Physics::Optics, Fano resonance, 02 engineering and technology, Fano plane, 021001 nanoscience & nanotechnology, 01 natural sciences, Atomic and Molecular Physics, and Optics, Electronic, Optical and Magnetic Materials, Terahertz spectroscopy and technology, 010309 optics, Mathematics::Algebraic Geometry, Optics, Q factor, 0103 physical sciences, Electrical and Electronic Engineering, 0210 nano-technology, business, Plasmon, Photonic crystal
Abstract

International audience; We investigate experimentally and numerically the Fano resonances of terahertz waves through a high resistivity silicon photonic crystal slab with a hexagonal array of circular air holes. Finite-difference time-domain simulation and terahertz time-domain spectroscopy transmission measurement show good agreement with the data, in support of the Fano resonance mechanism. The frequency dependent transmission spectra show there is a Fano resonance bandpass filtering characteristic at the center frequency of 2.10 THz with a Q factor of 191, which is consistent with that of Fano resonance theory calculation.

Published
2012
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11. Strain-controlled magnetic domain wall propagation in hybrid piezoelectric/ferromagnetic structures

Author

Lei, N., Devolder, T., Agnus, G., Aubert, P., Daniel, L., Kim, J. -V, Zhao, W., Trypiniotis, Theodossis, Cowburn, R. P., Chappert, C., Ravelosona, D., Lecoeur, P., ICHAMS - Equipe Interaction Champs - Matériaux et Structures, Laboratoire de génie électrique de Paris (LGEP), Université Paris-Sud - Paris 11 (UP11)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Ecole Supérieure d'Electricité - SUPELEC (FRANCE)-Centre National de la Recherche Scientifique (CNRS)-Université Paris-Sud - Paris 11 (UP11)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Ecole Supérieure d'Electricité - SUPELEC (FRANCE)-Centre National de la Recherche Scientifique (CNRS), and Université Paris-Sud - Paris 11 (UP11)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Ecole Supérieure d'Electricité - SUPELEC (FRANCE)-Centre National de la Recherche Scientifique (CNRS)

Subjects
geometry, Materials science, Kerr effect, Magnetoresistance, Magnetic domain, General Physics and Astronomy, magnetic field, anisotropy, 02 engineering and technology, electronic equipment, Bioinformatics, 01 natural sciences, 7. Clean energy, Article, General Biochemistry, Genetics and Molecular Biology, Condensed Matter::Materials Science, 0103 physical sciences, energy efficiency, 010302 applied physics, magnetic anisotropy, Multidisciplinary, hybrid, piezoelectricity, Spintronics, Magnetic logic, business.industry, electronics, article, integrated circuit, Magnetostriction, General Chemistry, 021001 nanoscience & nanotechnology, electric field, Magnetic anisotropy, Domain wall (magnetism), nanowire, Optoelectronics, 0210 nano-technology, business
Abstract

The control of magnetic order in nanoscale devices underpins many proposals for integrating spintronics concepts into conventional electronics. A key challenge lies in finding an energy-efficient means of control, as power dissipation remains an important factor limiting future miniaturization of integrated circuits. One promising approach involves magnetoelectric coupling in magnetostrictive/piezoelectric systems, where induced strains can bear directly on the magnetic anisotropy. While such processes have been demonstrated in several multiferroic heterostructures, the incorporation of such complex materials into practical geometries has been lacking. Here we demonstrate the possibility of generating sizeable anisotropy changes, through induced strains driven by applied electric fields, in hybrid piezoelectric/spin-valve nanowires. By combining magneto-optical Kerr effect and magnetoresistance measurements, we show that domain wall propagation fields can be doubled under locally applied strains. These results highlight the prospect of constructing low-power domain wall gates for magnetic logic devices., The use of electric fields to control the magnetization of ferromagnetic materials could enable more efficient electronics. Lei et al. show that by applying lateral strain to a magnetostrictive nanowire with a piezoelectric, voltage-controlled gating of magnetic domain wall motion in the wire can be achieved.

Published
2013
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12. Design of an ultrathin broadband transparent and high-conductive screen using plasmonic nanostructures

Author

Jiaming Hao, Said Zouhdi, Min Qiu, Cheng-Wei Qiu, Laboratoire de génie électrique de Paris (LGEP), Université Paris-Sud - Paris 11 (UP11)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Ecole Supérieure d'Electricité - SUPELEC (FRANCE)-Centre National de la Recherche Scientifique (CNRS), ICHAMS - Equipe Interaction Champs - Matériaux et Structures, and Université Paris-Sud - Paris 11 (UP11)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Ecole Supérieure d'Electricité - SUPELEC (FRANCE)-Centre National de la Recherche Scientifique (CNRS)-Université Paris-Sud - Paris 11 (UP11)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Ecole Supérieure d'Electricité - SUPELEC (FRANCE)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Materials science, business.industry, Optical communication, 02 engineering and technology, engineering.material, 021001 nanoscience & nanotechnology, Polarization (waves), 01 natural sciences, Atomic and Molecular Physics, and Optics, 010309 optics, Optics, Coating, Electrical resistivity and conductivity, 0103 physical sciences, engineering, Optoelectronics, Noble metal, 0210 nano-technology, business, Refractive index, Electrical conductor, Plasmon
Abstract

LGEP 2012 ID = 1262; International audience; In this Letter, we present a new type of ultrathin antireflection transparent and high-conductive screen based on plasmonic nanostructures that does not suffer from high loss and thickness coating and also can be used as good conductive material due to super electrical conductivity of the component (noble metal). Low reflection and greatly enhanced transmissions over a broad spectral range are observed at optical telecommunication frequencies in arbitrary polarizations. The performance is almost insensitive of the angle of incidence.

Published
2012
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13. Finite element modeling of magnetic field sensors based on nonlinear magnetoelectric effect

Author

Thu Trang Nguyen, Laurent Daniel, Xavier Mininger, Frédéric Bouillault, ICHAMS - Equipe Interaction Champs - Matériaux et Structures, Laboratoire de génie électrique de Paris (LGEP), Université Paris-Sud - Paris 11 (UP11)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Ecole Supérieure d'Electricité - SUPELEC (FRANCE)-Centre National de la Recherche Scientifique (CNRS)-Université Paris-Sud - Paris 11 (UP11)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Ecole Supérieure d'Electricité - SUPELEC (FRANCE)-Centre National de la Recherche Scientifique (CNRS), and Université Paris-Sud - Paris 11 (UP11)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Ecole Supérieure d'Electricité - SUPELEC (FRANCE)-Centre National de la Recherche Scientifique (CNRS)

Subjects
010302 applied physics, Physics, Field (physics), Condensed Matter::Other, Acoustics, Magnetoelectric effect, General Physics and Astronomy, Magnetostriction, 02 engineering and technology, 021001 nanoscience & nanotechnology, 01 natural sciences, Piezoelectricity, Finite element method, Magnetic field, Condensed Matter::Materials Science, 0103 physical sciences, Harmonic, 0210 nano-technology, Excitation
Abstract

LGEP 2011 ID = 732; International audience; Magnetoelectric effect in composite materials results from the combination of piezoelectric and magnetostrictive effects. This paper focuses on the development of a harmonic finite element formulation for such coupled problems, taking into account the nonlinearity of magnetostrictive behavior. An application to a magnetic sensor operating under dynamic excitation is presented in order to illustrate the formulation. The enhancement of the magnetoelectric coefficient when a low amplitude harmonic field is superimposed to the static field to be measured is shown to be related to the nonlinearity of magnetic and magnetostrictive behavior.

Published
2011
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14. Deterministic tool based on transmission line modelling and Kriging for optimal transmitter location in indoor wireless systems

Author

Lionel Pichon, A. Dalla'Rosa, A. Raizer, ICHAMS - Equipe Interaction Champs - Matériaux et Structures, Laboratoire de génie électrique de Paris (LGEP), Université Paris-Sud - Paris 11 (UP11)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Ecole Supérieure d'Electricité - SUPELEC (FRANCE)-Centre National de la Recherche Scientifique (CNRS)-Université Paris-Sud - Paris 11 (UP11)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Ecole Supérieure d'Electricité - SUPELEC (FRANCE)-Centre National de la Recherche Scientifique (CNRS), and Université Paris-Sud - Paris 11 (UP11)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Ecole Supérieure d'Electricité - SUPELEC (FRANCE)-Centre National de la Recherche Scientifique (CNRS)

Subjects
010302 applied physics, Engineering, business.industry, Transmitter, Real-time computing, 020206 networking & telecommunications, 02 engineering and technology, 01 natural sciences, Kriging, Robustness (computer science), Transmission line, 0103 physical sciences, 0202 electrical engineering, electronic engineering, information engineering, Electronic engineering, Wireless systems, Electrical and Electronic Engineering, business
Abstract

LGEP 2011 ID = 852; International audience; This study proposes a deterministic tool based on the combination of the transmission line modelling method and a Kriging interpolation to search for optimal transmitter locations in indoor wireless systems. As a first step, the relevance of the technique is presented. Secondly, the methods are described based on their own formulations. Following, the methodology to combine the methods is presented where a simple case is used to exemplify the procedure and evaluate the accuracy. A two-dimensional (2D) complex case is presented to verify the robustness of the technique, and a 3D environment is studied to demonstrate the tool capability.

Published
2011
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