H.D.R. Contributions à la compréhension du canal de propagation sans-fil MIMO : modèles, applications et perspectives – GAILLOT, DAVY

HABILITATION A DIRIGER DES RECHERCHES – UNIVERSITE DE LILLE

DAVY GAILLOT
27 mars à 10h30
Amphithéâtre 1A12 – IUT-A

 

Ecole doctorale : Sciences Pour l’Ingénieur (SPI)
Laboratoire/Etablissement : IEMN-IRCICA, Université de Lille – FST
Discipline : SCIENCES PHYSIQUES

LES MEMBRES DU JURY :

Garant de l’habilitation :

  • MME. LIENARD Martine, Professeure de l’Université de Lille – FST

Rapporteurs :

  • M. BENLARBI-DELAI Aziz, Professeur de Sorbonne Université
  • M. EL ZEIN Ghaïs, Professeur de l’INSA Rennes
  • M. VAUZELLE Rodolphe, Professeur de l’Université de Poitiers

Examiners :

  • M. CLAVIER Laurent, Professeur de l’Institut Mines TELECOM Lille-Douai
  • M. OESTGES Claude, Professeur de l’Université Catholique de Louvain, Belgique
  • SOUTENANCE : Mardi 27 Mars 2018 à 10h30, IUT-A Amphi 1A12

HDR_2018_Davy Gaillot

Seminar: About non-regular dynamics

By Alain Léger
Director of Research at the CNRS
Contact: leger@lma.cnrs-mrs.fr

Wednesday 28 March 2018 at 14:00
IEMN Ampli LCI - Villeneuve d'Ascq

Abstract:

This talk will present some aspects, first introductory, then more recent, of non-regular mechanics. A number of situations, edge conditions or behaviour laws provide examples of non-regularity in mechanics. We will concentrate mainly on the case of contact and friction, but several fundamental aspects would be identical in the cases of plasticity, damage, etc. In all cases, the introduction of non-regular conditions in continuum mechanics leads to open and difficult mathematical problems. To this end, an attempt will be made to give a detailed account of the current state of affairs, in the form of a list of problems that have been solved or are still open, so as to clarify the situations in which it is legitimate or not to use results from different areas of physics, and it will be observed that it is in these cases simple models which, provided they are well chosen, provide qualitative information where models closer to physics would be inaccessible.

It will be recalled that non-regularity removes the possibility of referring to the classical framework of the theory of differential equations or partial derivatives. After a few results, stated in the case of a very simple mechanical system but generalisable to all discrete problems, a large part of the presentation will be devoted to the study of the response to a periodic load, as is traditional in the qualitative study of dynamic systems.

Initially, the mechanical system will be linear, which will make the results usable qualitatively in many areas of physics, acoustics or vibrations. Particular attention will be paid to the transition between zones of different behaviour, and it should be noted that no transition to chaos is observed when the only non-linearity is due to contact and friction. We will then add a regular non-linearity of the large deformation type. We will then see that the response can include zones of non-periodic behaviour, which will lead us to question the coupling between different types of non-linearity.

 

Seminar: Molecular spin coupling at the tip of an STM

By Laurent Limot
CNRS researcher at the IPCMS in Strasbourg
Contact: limot@ipcms.unistra.fr

Wednesday 16 April 2018 at 10.30 a.m.
IEMN Boardroom - Villeneuve d'Ascq

 

Abstract:

Recent advances in addressing and controlling the spin states of a surface-supported object (atom or molecule) have further accredited the prospect of quantum computing and of an ultimate data-storage capacity [1]. Information encoding requires that the object must possess stable magnetic states, in particular magnetic anisotropy to yield distinct spin-dependent states in the absence of a magnetic field together with long magnetic relaxation times. Scanning probe techniques have shown that inelastic electron tunneling spectroscopy (IETS) within the junction of a scanning tunneling microscope (STM) is a good starting point to study the stability of these spin states [2]. STM-IETS allows for an all-electrical characterization of these states by promoting and detecting spin-flip excitations within the object of interest. As spin excitations need however to be preserved from scattering events with itinerant electrons, single objects are usually placed on non-metallic surfaces such as thin-insulating layers or superconductors. In this sense, new approaches to improve the detection of spin-flip excitations are desirable. With this purpose we present here a novel strategy based on the molecular functionalization of a STM tip. We study the surface magnetism of a simple doubledecker molecule, nickelocene [Ni(C5H5)2], which is adsorbed directly on a copper surface. By means of X-ray magnetic circular dichroism and density functional theory calculations, we show that nickelocene on the surface is magnetic (Spin = 1) and possesses a uniaxial magnetic anisotropy, while IETS reveals an exceptionally efficient spin-flip excitation occurring in the molecule [3]. Interestingly, nickelocene preserves its magnetic moment and magnetic anisotropy not only on the surface, but also in different metallic environments. Taking advantage of this robustness, we are able to functionalize the STM tip with a nickelocene [3,4], which can then be employed as a portable source of inelastic excitations. As we will show during the talk, IETS can then be used to probe the interaction between a surface-supported object and the nickelocene tip, including a magnetic interaction.

M. Ormaza1, P. Abufager2, B. Verlhac1, N. Bachellier1, M.-L. Bocquet3, N. Lorente4, and Laurent Limot1,*
1Université de Strasbourg, CNRS, IPCMS, UMR 7504, F-67000 Strasbourg, France
2Instituto de Física de Rosario, CONICET, Universidad Nacional de Rosario, Argentina
3Ecole Normale Supérieure, UPMC Univ. Paris 06, CNRS, 75005 Paris, France
4CFM/MPC and DIPC, 20018 Donostia-San Sebastián, Spain

References
[1] F.D. Natterer et al, Nature 543, 226 (2017); T. Choi et al, Nat. Nanotech. 6 (2017)
[2] A.J. Heinrich, J.A. Gupta, C.P. Lutz, and D.M. Eigler, Science 306, 466 (2004)
[3] M. Ormaza et al, Nano Lett. 17, 1877 (2017)
[4] M. Ormaza et al, Nat. Commun. 8, 1974 (2017)

 

 

date_04-05

Conference: Prototype of Terahertz Communications at 300 GHz: Devices, Packages

HO-JIN-SONG_Pohang_University_of_Science_and_Technology-POSTECH

Dr. HO-JIN SONG, Pohang University of Science and Technology (POSTECH)

Tuesday 5 April at 10.30 am

Conference 10:30
Anfiteather - IEMN-LCI Institut d'Electronique, de Microélectronique et de Nanotechnologie U.M.R C.N.R.S 8520 - Laboratoire Central - Cité Scientifique - Avenue Poincaré - CS 60069 - 59652 VILLENEUVE D'ASCQ CEDEX

Speakers

Pohang-University-of-Science-and-Technology_logo

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Innovation Tuesdays: The global challenge of energy storage for the future of the Internet of Things, alternative energies and mobility

Tuesday 20th March 2018

Welcome 18:00 - Conference 18:30 - 20:30
CNRS, 3 rue Michel-Ange, 75016 Paris

Energy storage technologies are at the heart of a major global challenge. The future of many innovations is linked to major advances in compact storage capacity and rapid battery recharging (cars and all other forms of mobility, including smartphones). As the major alternative energies (wind and solar) are not continuous, their effectiveness in future networks is also linked to improvements in electricity storage. As for the gigantic world of connected objects in the offing, this will require miniaturised batteries with very long lifetimes without recharging. While lithium is currently the leading material, with a wide range of combinations, other materials and alternative technologies such as fuel cells are making rapid progress. A journey to the heart of global competition, from advanced research into battery efficiency and recycling to access to materials, leading to a global industrial battle currently dominated by Asia.

Speakers

  • François BARSACQCEO, EasyLi, designer and manufacturer of energy storage solutions
  • Patrice SIMONElectrochemical Energy Storage Network, RS2E
  • Christophe LETHIENInstitute of Electronics, Microelectronics and Nanotechnology , IEMNUniversity of Lille, CNRS
  • Nicolas LECLERE, Head of the Electric Powertrain Innovation Division, PSA Group

Séminaire : « Quantitative Scanning Probe Microscopy Techniques for Heat Transfer Management in nanomaterials and nanodevices »

mardi 20 mars à 17h45 – ISEN Lille

Séverine Gomès
CNRS researcher, Micro and Nanoscale Heat Transfer group at the Centre for Energy and Thermal SciencesLyon University

Abstract: The control of heat flow is central to all technologies. According to the first law of thermodynamics, heat is the universal consequence of physical activity. At the same time modern material science and technology is increasingly devoted to the control of matter on the nanoscale and miniaturization of device elements well below 100 nm. By nano-structuring materials their physical properties may be engineered to achieve optimal performance. Examples include materials used in renewable energy generation (thermoelectric, photovoltaics) and structural composites. Thermal control is the dominant problem in many of these fields. For example, the continuous linear scaling of clock frequency in silicon device technology has been suspended for the last ten years as a direct consequence of the decreasing element size and increasing power density in VLSI systems. This is the first aspect of Moore's law to fail and it has failed directly because of thermal management problems at the nanoscale.

The flow of heat at the nanoscale is completely different from that experienced in macroscopic systems. The dominant phonon wavelengths at room temperature are of order a nanometer with ballistic mean-free path extending from tens of nanometers (in copper) to hundreds of nanometers in Si. Accordingly, at the nanoscale heat flow in solids ceases to be entirely diffusive and may, indeed, be quantized. Convection is suppressed. Radiative transport, where significant, takes place in the near field, since the wavelength of thermal photons is approximately 10 µm at room temperature. Accordingly, the normal methods of modelling and design used for macroscopic thermal work are completely inappropriate.

Effective tools for thermal measurement at the nanoscale are limited. The highest spatial resolution systems which are used for quantitative thermal measurement are based on optical effects, such as IR thermal emission, Raman spectroscopy or photo-reflectance. The spatial resolution of all of these methods is limited to 500 nm or greater. The key technique for thermal measurement at the nanoscale is Scanning Thermal Microscopy (SThM), but this remains highly non-quantitative in normal use. The need is for a complete thermal measurement and modelling technology for use at the nanoscale.

In this talk I will outline our efforts in better understanding the heat transfer and measuring thermal properties at the micro and nanoscales. I will give my feedback after four years as scientific coordinator of a European large scale- NMP Project QUANTIHEAT that was centered around the SThM technique to solve the problem of thermal metrology at the nano-scale and delivering validated standards, methods and modelling tools for nano-thermal design and measurement and gathered 21 strategic partners in Europe.

Organic shorts:
Dr Séverine Gomès received her European PhD in Physics at the University of Reims, France in 1999.
She is a permanent CNRS researcher, head of the Micro and Nanoscale Heat Transfer group at the Centre for Energy and Thermal Sciences (CETHIL), a common centre of the National Institute of Applied Sciences in Lyon, CNRS and the University Claude-Bernard of Lyon.
She was recruited in 2001 by CNRS in the area of Scanning Thermal Microscopy (SThM), a scanning probe microscopy method with which she worked during her PhD in collaboration with the group of Hubert Pollock and Azzedine Hammiche at Lancaster University (ULANC, UK). She was awarded the CNRS Bronze Medal in 2005 for her pioneering works on SThM.
Her main research interests deal with the development and the application of SThM and electrical methods with the goals of studying heat generation and transport at micro and nanoscales and measuring thermal properties of nanostructured materials and local temperature. During 8 years (2007-2014) she was co-responsible along with Prof. O. Kolosov (ULANC), for the 'Local Probes' group in the 'Advanced Metrology' axis of the CNRS-sponsored European Research Network: 'Thermal NanoSciences and NanoEngineering'. From dec. 2013 to nov. 2017, she was the scientific coordinator of the European large scale- NMP Project QUANTIHEAT.

Contact:
Séverine Gomes - CETHIL UMR 5008
Mail : Severine.gomes@insa-lyon.fr
Phone : 04 72 43 64 28

Séminaire CINTRA – THALES

A l’IEMN , en salle du conseil le Jeudi 8 Mars 2017 à partir de 9h15
 
UMI 3288 CINTRA, CNRS – NTU Singapore – Thales : Research activities and recent achievements
 
P. Coquet, Univ. of Lille – Director of CINTRA, B.K. Tay, NTU Singapore – Deputy Director, Q. Dinh, Thales Singapore – Deputy Director, D. Birowosuto.
Abstract:
CINTRA UMI 3288 is a joint laboratory between CNRS, Nanyang Technological University and Thales Group. It is located in Singapore and is developing research activities on Nano-electronics and Nano-photonics technologies. http://cintra.ntu.edu.sg/Pages/default.aspx
IEMN is one of the historical partners of CINTRA and there are several on-going projects between IEMN and CINTRA. The objective of the presentation will be to give an overview of the recent activities developed in CINTRA with the perspective of initiating new joint projects.

The 3 research thrusts of CINTRA will be detailed.
  • Carbon based Materials and Devices: Carbon nanotubes, graphene, BN, foam like materials, with applications in RF, 3D integration, thermal management, energy storage 
  • New Nano-materials and Structures: 2D TMD, nanowires, defect induce emitters, with applications in nano light sources, quantum sensing, gas sensing, radiation detection, energy harvesting
  • Nano-photonics Technologies: nanostructured optical fibers, III-V 

http://cintra.ntu.edu.sg/Pages/default.aspx

http://www.ntu.edu.sg/AboutNTU/CorporateInfo/Pages/Intro.aspx

Séminaire : Diagnostic et suivi en service de l’état de santé des matériaux et structures par intégration de capteurs, FR TTM CNRS 3733

Dans le cadre de la Fédération de Recherche ( FR CNRS 3733 ) Transport Terrestre & Mobilité (TTM), regroupant les quatre laboratoires de recherche : IEMN, CRIStAL, LML et LAMIH.

__________________________________________________________________________________________________

________________________________________________________________

Appel à participation
19 mai 2017 de 13h30 à 16h30 – IEMN DOAE Amphithéatre, Valenciennes

Ce séminaire est ouvert aux chercheurs des quatre laboratoires développant des activités en lien a vec le thème ( CND / SHM , Matériaux, Mécanique de la rupture, Capteurs et technologies associées, Traitement de signal et outils de diagnostique,…) et savoir-faire complémentaires. Le séminaire s’adresse également aux chercheurs qui n’ont actuellement pas de lien directe avec la thématique du séminaire mais qui souhaiteraient proposer leurs compétences et savoir-faire en complément.

Déroulement prévisionnel :
  • Présentation (facultative mais fortement encouragée) de 5 à 10 minutes maximum par participant, suivie de
  • Table ronde afin de discuter d’éventuels futurs collaborations et projets.

Merci d’envoyer :
┌ Nom et prénom
┌ Laboratoire
┌ Titre de la présentation.
┌ Court resumé (optionnel).

Avant le 24 avril 2017 à : farouk.benmeddour@univ-valenciennes.fr