[tt] advanced nanotechnology - 4 new articles

Eugen Leitl <eugen at leitl.org> on Wed Nov 7 09:33:47 UTC 2007 
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Date: Wed, 07 Nov 2007 03:17:40 -0500
To: eugen <eugen at leitl.org>
Subject: advanced nanotechnology - 4 new articles
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"[2]advanced nanotechnology" - 4 new articles

    1. [3]Electronic spin controlled with electric fields instead of
       magnetic
    2. [4]Spintronics - MRAM advancing to Gigabit capacity
    3. [5]Submarine acoustic invisibility
    4. [6]Submarine acoustic invisibility
    5. [7]More Recent Articles
    6. [8]Search advanced nanotechnology

[9]Electronic spin controlled with electric fields instead of magnetic

   [10]Researchers at the Delft University of Technology's Kavli
   Institute of Nanoscience and the Foundation for Fundamental Research
   on Matter (FOM) have succeeded in controlling the spin of a single
   electron merely by using electric fields. This clears the way for a
   much simpler realization of the building blocks of a (future)
   super-fast quantum computer. 
   [scientistsro.jpg]

     An electron microscope photo of a nanostructure similar to that
     used in the experiment. The light-grey colors show the metal
     structure (made of gold) used to create an electric trap (white
     lines) for the electrons. A voltage (V) that changes with time is
     applied to the rightmost piece of metal. As a result, the electron,
     which is locked in the right trap, feels an electric field. This
     electric field causes the electron to move (white dotted line), so
     that the position of the electron changes with time. Credit: TU
     Delft

   [11][advancednano?i=SPvmoWB] [12][advancednano?i=ZItXw9B]
   [13][advancednano?i=uSsxjAb] [14][advancednano?i=HPrH2hb]
   [15][advancednano?i=ShAKnab] [16][advancednano?i=xn5WMZB]
   [17][advancednano?i=mDzZU3b] [18][advancednano?i=ocXnbTB] 
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   magnetic'

[24]Spintronics - MRAM advancing to Gigabit capacity

   [25]Toshiba Corporation today announced important breakthroughs in key
   technologies for magnetoresistive random access memory (MRAM), a
   promising, next-generation semiconductor memory device.
   [toshibadevel.gif]
   Cell Structure. A material with perpendicular magnetic anisotropy,
   which is used for recording media and a type of cobalt-iron, is
   employed in the magnetic layer, with magnesium oxide in the insulating
   layer and cobalt-iron-boron in the interface layers. Credit: Toshiba

     Toshiba applied and proved the spin transfer switching and
     perpendicular magnetic anisotropy (PMA) technologies in a magnetic
     tunnel junction, which is a key component in the memory cell.
     Spin transfer switching uses the properties of electron spin to
     invert magnetization and writes data at very low power levels. It
     is widely regarded as a major candidate among next-generation
     principles for new memory devices. PMA aligns magnetization in the
     magnetic layer perpendicularly, either upward or downward, rather
     than horizontally as in in-plane shape anisotropy layers.
     The technology is being increasingly used to enhance for storage
     capacity for high-density hard disc drives (HDDs), and Toshiba has
     successfully applied it to a semiconductor memory device. With PMA
     data write operation and magnetic switching can be achieved at a
     low energy level. Toshiba also overcame the hurdle of achieving the
     required precision in the interface process and significantly
     cutting write power consumption.
     In order to realize a miniature memory cell based on PMA, Toshiba
     optimized the materials and device structure of the new MRAM.

   [26][advancednano?i=O2tmwXB] [27][advancednano?i=F6vntwB]
   [28][advancednano?i=kHk42Eb] [29][advancednano?i=3SiSmcb]
   [30][advancednano?i=cZNlmib] [31][advancednano?i=yBGf9wB]
   [32][advancednano?i=dMz9c6b] [33][advancednano?i=D2yPo4B] 
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[39]Submarine acoustic invisibility

   [40]Submarines could be made less visible to sonar using metamaterials
   There are still many challenges to overcome including the variability
   of the surrounding water and enabling lack of sonar reflection from
   more than one direction (ie another submarine at the same depth unable
   to detect but one above or below could)
   [41][advancednano?i=CvmKMsB] [42][advancednano?i=1UIbmDB]
   [43][advancednano?i=Z48cStb] [44][advancednano?i=EvAg0rb]
   [45][advancednano?i=6X04ynb] [46][advancednano?i=PwTDRdB]
   [47][advancednano?i=Kkw4h1b] [48][advancednano?i=LKrgOVB] 
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[54]Submarine acoustic invisibility

   [55]Submarines could be made less visible to sonar using metamaterials
   There are still many challenges to overcome including the variability
   of the surrounding water and enabling lack of sonar reflection from
   more than one direction (ie another submarine at the same depth unable
   to detect but one above or below could)
   [56][advancednano?i=yOHyXdB] [57][advancednano?i=bVz8TMB]
   [58][advancednano?i=iHqmAVb] [59][advancednano?i=OGMRV3b]
   [60][advancednano?i=eL8o8pb] [61][advancednano?i=wTI79SB]
   [62][advancednano?i=87cvhFb] [63][advancednano?i=P4lDfpB] 
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More Recent Articles

     * [69]Two proposals for mining the Ocean for $720 trillion worth of
       Uranium
     * [70]Tartan Racing, Pittsburgh, PA wins the Darpa Urban challenge
     * [71]Ultrasensitive prototype device approaches gold standard for
       magnetic field detection
     * [72]Climate change bill has passed a senate panel
     * [73]Transitioning from oil

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Eugen* Leitl <a href="http://leitl.org">leitl</a> http://leitl.org
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