11-02/03 :: February / March 2011
nanotimes News in Brief
seismic testing, it analyzes physical changes the wave encounters in the material – diffraction and heterodyning – and uses this information to deter- mine the conditions within the material itself.
“We follow the sound field,” Bulavinov notes, “and calculate the workpiece characteristics on the basis of that.” Similar to computer tomography in medici- ne, in the end we receive three-dimensional images of the examined object where any imperfections are easy to identify. The startling thing about this ap- proach is that with it, a fissure is now visible even if the ultrasound was not specifically directed at it. I-Deal Technologies, an IZFP spinoff, markets testing systems based on this principle.
The IZFP is also demonstrating this method at Control 2011, the International Trade Fair for Qua- lity Assurance, in Stuttgart from May 03-06, 2011 (Hall 1, Stand 1502).
Contact: Dr. Ing. Andrey Bulavinov, Dr. Ing. Roman Pinchuk c/o Fraunhofer IZFP, DE, Phone: +49 (0) 681 / 93023955:
http://i-deal-technologies.com
Scientists at Oxford University and the Institut Laue-Langevin have used neutrons to probe the magnetic glue thought to produce high tempera- ture superconductivity and have identified stripes of magnetic moments and charge as the cause of a strange hourglass-shaped magnetic spectrum. Their findings will aid the search for a model of high temperature superconductivity. The team instead turned their attention to an insulating cobalt oxide
with a similar magnetic stripe pattern. Using neu- tron scattering at the ILL, the flagship centre for neutron science, the scientists measured the ato- mic-scale fluctuations in its magnetism and unco- vered the same hourglass pattern in the data. Their results provide strong evidence that magnetic stripes are the cause of the hourglass spectrum and play an important role in high temperature superconducti- vity.
“Our cobalt oxide compound is a magnetic look- alike for the high temperature superconductors,” says Professor Boothroyd (Oxford University). “Its lack of mobile electrons prevents it from becoming superconductive, allowing us to use neutron scat- tering to look in detail at nano-scale fluctuations in the magnetic motion without the complicating
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© IZFP, Germany / I-Deal Technologies
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