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    Physicists discover keys to improving magnet technology, etc.
    Posted on Sunday, November 20, 2005 @ 17:27:13 GMT by vlad

    Science Permanent magnets are important in a broad variety of commercial technologies, from car starters to alternators for wind power generation to computer hard drives. Researchers at the U.S. DOE's Argonne National Laboratory have found new clues into ways to make those magnets longer-lasting and more powerful.

    Full story at http://www.physorg.com/news8305.html

    Using the Western Hemisphere's most powerful X-rays at the Advanced Photon Source at Argonne, the researchers were able to see new details of rare-earth ions, a critical component of permanent magnets. The examination of the ions, probing their magnetism with unprecedented resolution, revealed that the presence of rare-earth ions in more than one atomic environment reduces the magnetic stability of the best-performing permanent magnets to date. This knowledge will enable manufacturers to manipulate the rare-earth ion atomic structure for optimization of future magnets.

    The research is published this week in Physical Review Letters.

    Rare-earth ions come from metallic elements that share similar chemical properties; they are not especially rare, but they are used sparingly because of the high cost in preparation of the materials. Rare-earth ions play an important role in determining magnetic stability again demagnetizing fields, and therefore in magnet performance.

    "The research found that rare-earth ions in dissimilar crystalline environments compete with one another, and undermine the magnetic performance of the highest performance magnets," said Argonne scientist Daniel Haskel, who led the research team. "These findings point to the need for specialized atomic engineering of the material – manipulating the rare-earth local atomic structure to fully utilize the rare-earth contribution in next generations of magnets."

    Source: Argonne National Laboratory
    -------------------

    BEYOND EINSTEIN: A LIVE WEBCAST FROM AROUND THE GLOBE, November 18 Thursday, December 1, 2005 from 12:00 to 24:00 CET
    CERN and the World Year of Physics International Steering Committee are partnering with some of the world's leading physics laboratories, science museums and technology partners to present a twelve-hour live webcast to celebrate Einstein and look beyond the World Year of Physics 2005.
    Full story at http://www.physorg.com/news8318.html

    SPACE-TIME VORTEX, November 17
    Is Earth in a vortex of space-time? We'll soon know the answer: A NASA/Stanford physics experiment called Gravity Probe B (GP-B) recently finished a year of gathering science data in Earth orbit. The results, which will take another year to analyze, should reveal the shape of space-time around Earth--and, possibly, the vortex.
    Full story at http://www.physorg.com/news8256.html

    NATURE IS 'ALWAYS MORE CRAZY THAN WE ARE', November 16
    Astronomers say more than a thousand planets might be lurking in our galactic neighborhood. That's the conclusion they reached in explaining the genesis of a giant planet discovered in July by Maciej Konacki, then at the California Institute of Technology in Pasadena.
    Full story at http://www.physorg.com/news8245.html


     
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