Highlights 2010

December 2010

To protect themselves, bacteria possess within their membranes a kind of external skeleton made of a polymer, the peptidoglycan.
We have just discovered a new spin ice, i.e., a magnetic system with a residual entropy at low temperature.   Statistical physics teaches us that a system’s entropy goes to a finite limit when the temperature approaches absolute zero.
Contact: Vincent Baltz
The interaction between ferromagnetic and anti-ferromagnetic materials is known as exchange anisotropy, and it constitutes one of the foundations of spin electronic devices such as hard disk read reads, magnetic random access memories, and magnetic oscillators for use in telecom devices.

November 2010

Contact: Vincent Calvo
Silicon nanowires are studied in many projects related to the future of electronics, photovoltaic conversion, thermoelectricity, sensors etc. But their electronic properties are still not well-known.
Contact: Arnaud Buhot
Viscosity of polymer melts depends on the chain length. However, experimental observations have differed from theoretical predictions of this relationship for more than 40 years. Numerical simulations accounting for fluctuating effects of the chain length allow us to reconcile this point.
Spintec has discovered and patented a new technology to fabricate spintronic oscillators, which have high purity radiofrequency emissions several hundred times more powerful than that of traditional oscillators.

October 2010

Contact : Michael Quinsat
In collaboration with LETI and Hitachi, Spintec has recently developed a technique to extract the non-linear parameters characteristic of the frequency line width of spintronic oscillators.
The absence of friction (a.k.a. superglide) certainly sounds appealing to all skiers. Some boundaries can indeed have this property.
In collaboration with Institut Néel, ENS Lyon, LEGI and IRAMIS, an apparatus was developed at SBT for the study of turbulence in superfluid helium. Our measurements show that the mechanism of energy transfer follows the same Kolmogorov law as do the classical viscous fluids.

September 2010

We have designed, in collaboration with the Department of Molecular Chemistry at UJF, new one-dimensional organic objects capable of capturing metal ions. The color or visco-elasticity of these wires can be changed by simply applying a voltage.
Contact : Jérôme Moritz – SPINTEC
Spintec proposes a method to greatly increase the data storage density in hard disk drives. The potential of this technique has been demonstrated experimentally.   The ever-increasing need for computing power also implies an increase of the data volume being used and stored.
Contact : Georgios Katsaros – SPSMS
When two superconductors are connected through a tunnel junction, electron pairs -- the so-called Cooper pairs -- can flow from one to the other. This phenomenon is known as the Josephson effect.

June 2010

In order to keep their genomic integrity, cells are equipped with several systems for the repair of modified bases in DNA. Scientists form INAC and IRCM (CEA/DSV-CNRS) have shown that the so-called “tandem lesions” are quite frequent and yet poorly repaired.
Contact: Fanny Clavel - SBT
SBT has a refrigerator called the “400W@1.8K” test facility. One of the challenges facing this type of machine is to ensure stable operation under extreme thermal perturbations.
Contact: Peter REISS
Increasing storage density is an important issue for the magnetic recording industry. Magnetic particles only a few nanometers in diameter offer a promising alternative to the media obtained by "etching" to the scale of a few tens of nanometers.

May 2010

The uranyl (V) cation UO2+ plays an important role in the chemistry of uranium. It occurs particularly in biological processes or as a disturbing element in the reprocessing of nuclear waste. However, these compounds are generally extremely difficult to study because unstable.
Contact: Tobias Schülli – SP2M
What is the connection between a cloud and a gold droplet?  Answer: Super-cooling, the property of a substance in a liquid state under conditions where it should be solid.
Contact: Dai Aoki
It has been known for a couple of years that superconductivity in correlated electron systems can coexist with a ferromagnetic state.

April 2010

Contact: Pascal Mailley – SPrAM
In a biosensor, a bioreceptor (enzyme, antibody, DNA probe ...) is hung upon an electronic substrate. When the bioreceptor recognizes a target molecule, the substrate must be able to effectively transduce this event into an interpretable signal.
Doping is essential for electronic or optical properties of semiconductors. The race to shrink components (transistor channel, quantum dots and wires) requires mastering the positioning of dopants in nanostructures.
In the quest for high critical temperature superconductors (HTCS), a new family of iron-based compounds was discovered in 2008, some of them containing arsenic while others, more recently found, contain selenium or tellurium.

March 2010

Using hydrogen as a power resource requires transforming it into electricity, and vice-versa. These reactions are usually catalyzed by platinum, a noble and rare metal. The iRTSV, associated with Liten and Iramis, has proposed compounds based on nickel as an alternative.
The realization of an efficient, on-demand, single photon source is an important goal for quantum cryptography and, more generally, for photonic quantum information processing.

February 2010

Contact: Xavier Jehl
Following the downsizing of microelectronics devices, a large variability in the characteristics of nominally identical transistors is observed.
In an organic photovoltaic cell, the electrical charges are created by the absorption of light near an interface existing between two materials.
Accurate experimental measurements have confirmed theoretical predictions made at Spintec concerning spin transfer torque in magnetic tunnel junctions. This effect lies at the heart of future spintronic applications.


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