Faits marquants 2011

Décembre 2011

06 décembre 2011
Contact: Fernando González-Posada
Semiconductor nanowires have become the building blocks for the fabrication of a new generation of photonic components. In this context, the CEA-CNRS joint group NPSC fabricates high crystalline quality GaN nanowires. They show a remarkable sensitivity in the ultraviolet as we have demonstrated by ... Lire la suite »
03 décembre 2011
Modeling strongly correlated systems is a very delicate task. For instance, the theory for the phonon spectrum of uranium has only been available since 2008. Our recent measurements have confirmed this theory and our results combined with new calculations provide an interpretation for the very ... Lire la suite »
02 décembre 2011
Contact: Peter Reiss
In collaboration with Leti, we have successfully transferred fluorescent semiconductor nanocrystals into aqueous medium without degrading their colloidal stability nor their fluorescence efficiency. This technique applies to many families of nanocrystals and is particularly attractive for non-toxic ... Lire la suite »
 

Novembre 2011

05 novembre 2011
Two-phase thermal links can transfer high power over long distances with an attractive efficiency/mass ratio. At cryogenic temperatures, a priming system is needed to reach the operating temperature. The SBT has designed, manufactured, and successfully tested a new priming system to equip a ... Lire la suite »
03 novembre 2011
Contact: Van Dai Nguyen
Magnetic imaging techniques can be used to observe magnetic walls. We have shown that this can also be achieved by measuring electrical resistance. This is done based on the collective vibrations of the magnetic moments (magnons). We are able to position a domain wall in a lithographed nanowire ... Lire la suite »
03 novembre 2011
How much do spins in a complex and disordered paramagnetic material contribute to macroscopic magnetization? Through the study of doped polyaniline samples, the SCIB/RM laboratory jointly with the SPrAM/LEMOH and the Polytechnic University of Warsaw have shown that pulsed Electron Spin Resonance ... Lire la suite »
02 novembre 2011
Un prototype de microspectromètre SWIFTS (Stationary Wave Integrated Fourier Transform Spectrometer) a été réalisé à partir d'un réseau de détecteurs de photons uniques à base de nanofils supraconducteurs (SNSPD, Superconducting ... Lire la suite »

Octobre 2011

20 octobre 2011
Some of the secrets of fuel cell electrodes have been uncovered thanks to large facilities: microstructure and transport properties have recently been studied by neutron scattering in the in the context of a joint Nissan and CEA work project. Surprisingly, Nafion® as a thin electrolyte layer ... Lire la suite »
17 octobre 2011
Contact : Yoann ROUPIOZ
Yoann Roupioz (CR1 CNRS, SPrAM) a reçu un des quatre prix décernés en 2011 par la société japonaise HORIBA. Il est mis à l'honneur pour ses travaux sur les puces à cellules et le suivi en temps réel des sécrétions cellulaires, ... Lire la suite »
04 octobre 2011
The distribution of cold power in cryogenic systems is becoming increasingly important, in particular because of the replacement of cryogen baths by mechanical cryocoolers which are local cold sources. Two-phase systems (heat pipes) are good candidates to address this new problem. The SBT has ... Lire la suite »
02 octobre 2011
Contact : Arnaud BUHOT
Deux étudiants du SPrAM, Feriel Mélaïne et Robin Pinilla, font partie de l'équipe mixte UJF/Grenoble-INP qui s'est qualifiée pour la finale mondiale de la compétition iGEM à Boston (USA) les 5-7 novembre prochains. L'équipe grenobloise a ... Lire la suite »
02 octobre 2011
Contact: Gilles Gaudin
Spintec researchers, in collaboration with the Catalan Institute of Nanotechnology and the Autonomous University of Barcelona have developed a new technique to write information in a magnetic memory cell in a more stable manner and at a lower energy cost. This technique opens up very promising ... Lire la suite »
 

Septembre 2011

23 septembre 2011
Ce résultat fait la couverture de Phys. Rev Lett. 107 (13). L'article signé par S. Raymond et al., Understanding the Complex Phase Diagram of Uranium: The Role of Electron-Phonon Coupling, décrit les résultats d'une étude expérimentale couplée ... Lire la suite »
08 septembre 2011
In the same way that the invention of the transistor revolutionized electronics, the development of ultrafast all-optical switches is a major stake for very high rate information processing, for instance for very high rate telecommunications. In collaboration with the University of Twente, the NPSC ... Lire la suite »
05 septembre 2011
In a molecule bearing several unpaired local spins, one of the pertinent parameters that govern its magnetic properties is the magnetic exchange interaction constant J that describes the way spins “talk to each other” through the atoms connecting them (bridges). The RM laboratory, by ... Lire la suite »
01 septembre 2011
JT-60SA is the future tokamak of the Japan Atomic Energy Agency (JAEA). Superconductive magnets will be used to confine the plasma. The fusion reactor is jointly constructed through the Broader Approach Agreement involving Europe and Japan and it shall be in operation in 2016. CEA has the ... Lire la suite »

Août 2011

23 août 2011
Le numéro de septembre des C.R. Physique propose un dossier intitulé Nanosciences et nanotechnologies:espérances et inquiétudes coordonné par J. Villain et L. Laurent. Une fois n'est pas coutume, ce numéro s'adresse à un public très ... Lire la suite »
 

Juillet 2011

01 juillet 2011
Le numéro de juin-août des C.R. Physique est consacré à la supraconductivité des systèmes fortement corrélés. Trois contributions sont signées par des chercheurs du SPSMS, témoignant de sa forte empreinte internationale sur ce ... Lire la suite »
 

Juin 2011

20 juin 2011
L’excellence de l’INAC vient d’être  brillamment illustrée par l’obtention de trois chaires ERC « Starting grant » en 2011 pour Eva Monroy (projet TERAGAN), Silvano De Franceschi  (projet HYBRIDNANO) et Max Hofheinz (projet ... Lire la suite »
04 juin 2011
An ambitious instrumental project has just succeeded in the LEMOH laboratory, providing a way for developing mesoscopic devices within an atomic force microscope (AFM), by evaporation through a mask, in combined mode with imaging. This achievement paves the way for the fabrication and in situ study ... Lire la suite »
01 juin 2011
Pulsed ESR (electron spin resonance) is a method of magnetic resonance where magnetic moments associated with electronic spins are detected and analyzed. In the SCIB/LRM group, we use a technique of electrical or optical detection of the ESR signal that makes it possible to increase the sensitivity ... Lire la suite »
 

Mai 2011

12 mai 2011
Les clusters nanométriques d'oxyde et d'hydroxyde d'actinides (uranium, plutonium) jouent un rôle important dans la technologie pour l'industrie nucléaire, dans la migration des actinides libérés dans l'environnement par l'extraction minière, la production ... Lire la suite »
09 mai 2011
Evan SPADAFORA, en thèse au SPrAM/LEMOH, a reçu un "Graduate student research award" lors de l'E-MRS spring Meeting qui s'est tenu à Nice du 9 au 13 mai 2011.  il est récompensé pour sa contribution intitulée "High Resolution Kelvin Probe Force Microscopy on Nanoscale Phase Segregated Bulk ... Lire la suite »
05 mai 2011
Jean-Philippe Attané est Maître de Conférences UJF à l’UFR PHITEM. Il mène ses activités de recherche au sein du laboratoire Nanostructure et Magnétisme (SP2M/NM). Sa nomination récompense ses travaux sur l'étude physique ... Lire la suite »
05 mai 2011
Contact: Joël Eymery
The CEA-CNRS-UJF joint “nanophysics and semiconductors” group studies the vapor phase growth of GaN-based nanostructures, including InGaN heterostructures. By understanding the growth mechanisms, we can obtain original structures such as wires or pyramids. Their practical interest is ... Lire la suite »
04 mai 2011
Based on numerical simulations, we have reached a new step in our understanding of the mechanisms that drive the growth of carbon nanotubes.   One of the most commonly used methods for synthesizing carbon nanotubes is chemical vapor deposition (CVD). The reaction involves a liquid ... Lire la suite »
03 mai 2011
Contact: Lionel Duband
Gaze at the Eagle Nebula, close to the centre of our Galaxy. Star forming regions can be spotted in this picture (centre and left portion). According to astrophysicists, hundreds of stars are born here. This picture was taken in April 2010 by two of the instruments on board the Herschel satellite ... Lire la suite »

Avril 2011

22 avril 2011
Une équipe INAC associée avec des chercheurs néerlandais de l’université de Twente a réalisé l’interrupteur photonique « tout optique » le plus rapide du monde : la double commutation s’effectue en moins d’une ... Lire la suite »
05 avril 2011
Contact: Xavier Jehl
We have designed and fabricated the first electron pump using silicon on insulator (SOI) in a standard microelectronics technology. These devices could be used as electrical current standards.   The definition of the ampere in the international system of units is based on the force ... Lire la suite »
02 avril 2011
Contact: Éric Gautier
At Spintec, in collaboration with the Laboratory of Advanced Microscopy of SP2M, we have developed a sample preparation technique for electron holography imaging. With this technique, we can draw a map of the magnetic field in a sample consisting of magnetic bilayers developed for multilevel ... Lire la suite »
02 avril 2011
Contact: Daniel Communal
In collaboration with SPrAM, SBT has developed a temperature sensor based on fluorescent nanocrystals and optical fiber for temperature measurements in the range 4-40 K.   This type of sensor is based on the fluorescence decay of nanocrystals. The decay time, i.e. the time it takes for ... Lire la suite »

Mars 2011

04 mars 2011
Semiconductor quantum dots have potential applications, in particular in the field of quantum cryptography. The precise determination of the emission properties of these emitters is thus an important stake. The CNRS-CEA joint group NPSC has developed a new experimental technique that can be used to ... Lire la suite »
03 mars 2011
The impact of nanoparticles on health is a burning question for the general public. Teams from the SCIB and IRAMIS/SPAM have studied the damage caused to cultured human cells by nanoparticles of titanium dioxide, used in sunscreens and in paints.   The toxicity of nanoparticles is not ... Lire la suite »
01 mars 2011
Contact: Gérard Gebel
A fuel cell generates electricity, heat and water. Water distribution strongly impacts the performance of the battery: the how and why deserves attention! Researchers at Inac and Liten had already put an operating fuel cell in a neutron beam. Now they have placed the system in an X-ray beam at ... Lire la suite »
 

Février 2011

04 février 2011
Contact: Abhinav Jain
Ferromagnetic semiconductors are very attractive for spintronics: the spin polarization of carriers is strong and the magnetic properties can be controlled with an electric field. So far, the manganese-germanium alloy (GeMn) grown in thin films is the best candidate because of its Curie temperature ... Lire la suite »
02 février 2011
Contact: Manuel Houzet
The maximum supercurrent (I.e. the dissipationless current) that can flow through a Josephson junction made of two superconductors separated by ferromagnetic material, strongly decreases with the thickness of this latter material. We had theoretically predicted that the stacking of appropriate ... Lire la suite »
01 février 2011
Were you aware that atomic disorder in a metal could result in a quantum transition to an insulating state? Then, what about it when the metal is also a superconductor? Spatially resolved tunneling spectroscopy has revealed the spectral signature of this transition in this paradoxical ... Lire la suite »
 

 

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