Highlights 2009

December 2009

13-12-2009
The ultraviolet portion of the solar spectrum is at the origin of skin cancers. Two ranges are defined: UVB radiation is the most energetic (280-320 nm), while UVA is less powerful but at least 20 times more frequent. We have shown that, in spite of low absorption by the genome, UVA rays can induce ... More »
09-12-2009
In our magnetic levitation facility OLGA, in a low magnetic field, we have observed a beautiful ferrofluid behaviour of liquid oxygen, close to its critical point.   Ferrofluids are liquids loaded with magnetic colloids. Their free surfaces may be subject to shape instabilities whenever ... More »
01-12-2009
In collaboration with the Institut d’Electronique Fondamentale (Orsay) and Spintec, we have studied in detail the effect of an electric current within a magnetic nanostructure, in order to better understand the spin transfer phenomenon. This complex effect, involving interactions between ... More »
 

November 2009

15-11-2009
Contact: Yoann Roupioz
Collaboration between the CNRS-LAAS in Toulouse and the CNRS-SPrAM at the CEA-Grenoble has allowed the set-up of new biochips, capable of capturing blood cells and their organization on a surface. This work paves the way to studies and analysis at the individual cell level.   One of the ... More »
12-11-2009
Copper is a trace element, essential to all living cells. However, an excess of this metal can induce severe diseases. The SCIB has designed a sulfur-rich bio-mimetic molecule, able to selectively encapsulate copper. This work opens the route to an efficient and targeted treatment of copper ... More »
10-11-2009
One of the main characteristics of high critical temperature superconductors is the existence of an abnormally small density of electronic states at the Fermi level, in the normal state. We have just witnessed similar behaviour in a conventional, albeit very disordered, ... More »
 

October 2009

25-10-2009
Contact: Lucien Notin
In pressurized water nuclear plants, it is important to know the evolution of the mechanical properties of steel which is subjected to radiation and to temperatures around 300°C. At Areva’s request, we have resumed the elaboration of temperature indicators for future ... More »
18-10-2009
High-frequency pulse tube technology (30 ~ 50 Hz) meets space vibration and reliability requirements but, up until now, was restricted to temperatures greater than 35 K. An experimental program has been devised, aimed at reducing the temperature by means of an ingenious ... More »
10-10-2009
A neutron resonance spin echo (NRSE) option has recently been installed on the three-axis spectrometer IN22 (CRG at the ILL). This device enables a gain up to two orders of magnitude in terms of energy resolution, and permits precise measurements of dispersive excitation lifetimes.   The ... More »
 

September 2009

21-09-2009
Contact: Pierre Terech
In order to take advantage of specific properties from nano-objects, one must be able to handle them, to deposit them wherever desired, and be able to read the information they carry. This is why the elaboration of "smart" substrates to capture these nano-objects at precise locations is ... More »
20-09-2009
Spintronics created magnetic memories and radio-frequency oscillators based on similar stacks of magnetic and non-magnetic layers. In an oscillator, a continuous current of spin-polarized electrons flowing across the stack produces a steady magnetization precession of one layer, at the origin of ... More »
08-09-2009
The immobilization of redox compounds – which are able to gain or lose electrons – on silicon paves the way for the development of new hybrid memories. The SCIB, in collaboration with the LETI, showed that by increasing the length of the link between the redox centre and the silicon, ... More »
 

June 2009

12-06-2009
Contact: Eva Monroy
Light emitting diodes (LEDs) are set for a brilliant future: it is forecasted that they will one day replace all other lighting devices because they consume less power. For LEDs emitting in the near UV, the blue and the green, the active material is gallium nitride (GaN). One could increase the ... More »
06-06-2009
Contact : Roser Vallcorba
The main aim of the ITER fusion process is to generate 500 MW of heat power for a period of several minutes, from a 50 MW power input source. The indispensable condition: "proper" cooling of several tens of kilometres of superconducting windings that confine the plasma. In collaboration ... More »
01-06-2009
After more than 20 years of intense research, the nature of the phase which appears below 18 K in the compound URu2Si2 remains a mystery. Until now, no measurement using a microscopic probe has been able to directly link a physical parameter to this phase. We have just shown that this phase is ... More »
 

May 2009

25-05-2009
Contact: Daniel Imbert
Lanthanides are metals widely used, especially for imaging. They form molecular compounds that are unfortunately labile, that is to say unstable, hindering their development. The ionic recognition laboratory of SCIB, together with Liten, has developed a method of stabilization of lanthanide ... More »
06-05-2009
Contact: Peter Reiss
The controlled assembly of semiconductor nanorods is a key step towards exploiting their anisotropic conductive and fluorescent properties in optoelectronic devices.  We assembled CdSe nanorods between electrodes under an electric field. Using optical excitation in addition to the electric ... More »
01-05-2009
Contact : Dimitri Houssamedine
With original measurements on high quality samples, Spintec laboratory, in collaboration with Leti and Hitachi, has just revealed one of the reasons why the performance of radio frequency spin oscillators still remains limited. Our studies show that the quality of the oscillators is inherently very ... More »
 

April 2009

11-04-2009
An unavoidable consequence of aerobic life is the production of reactive oxygen species (ROS) such as superoxide anions, hydrogen peroxide and hydroxyl radicals, which are capable of damaging numerous cellular components, including nucleic acids, proteins and lipids. In collaboration with DSV, a ... More »
06-04-2009
Contact: Georgios Katsaros
Starting with a self-assembled SiGe island, we have fabricated a device in which we can precisely control the number of charge carriers. Thanks to the properties of the material in use, this device provides a means to manipulate the spin of the charge carriers in an unprecedented ... More »
03-04-2009
We developed new bi-functional molecules which can be “anchored” to one side of a surface, and can “recognize” a complementary molecule on the other side. This molecular recognition is achieved by weak interactions that are non-covalent and reversible. After grafting these ... More »
 

March 2009

22-03-2009
Contact: Michel Bardet
The Magnetic Resonance Laboratory (SCIB/LRM), in collaboration with Arc Nucléart, iRTSV and INRAP, has succeeded in explaining the origin of the excellent preservation of old leather, after having spent several centuries buried in sediments.   During works for the construction of ... More »
15-03-2009
Contact: Gilles Gaudin
In Hard disk drives and magnetic memories, information is stored in a magnetic domain, associating magnetization direction to logic 1 and 0, up or down direction, which is written using a magnetic field. To locally manipulate the border of these domains, the domain wall, with an electrical current ... More »
05-03-2009
Contact: Nicolas Pauc
The scanning electron microscope allows one to obtain nice images, or to draw nanostructures. The beam can also be used for physical measurements :measurements: for instance, the measure of the e-beam induced current (EBIC) is a convenient way of analyzing carrier diffusion properties in ... More »
 

February 2009

22-02-2009
Contact: Gérard Gebel
Water management is a key issue for optimizing fuel cell operations. A dry polymer membrane induces a drop in performance due to low proton conductivity. An excess of water induces a flooding of the electrodes. A specific fuel cell has been built in collaboration within CEA-LITEN which is ... More »
16-02-2009
Contact: Tobias Schülli
Take two reactive substances. Add them together… nothing happens. Now, add a tiny bit of magic powder. A miracle occurs! The reaction takes place. This is the mystery of catalysis. What is at stake is both fundamental – understanding the mechanisms that rule catalytic activity – ... More »
03-02-2009
Contact : Massimo Mongillo
Using a single silicon nanowire, we have made the first prototype of a multipurpose device which can be used as a field effect transistor, a Schottky diode or a p-n diode. We obtain these functions using electrostatic gates to control the interfaces between the metallic source and drain contacts, ... More »
 

 

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