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Saturday, March 4, 2006

 

A new magnetic phenomenon may improve RAM memories and the storage capacity of hard drives

`A team of scientists from the Universitat AutÚnoma de Barcelona, in collaboration with colleagues from the Argonne National Laboratory (USA) and the Spintec laboratory (Grenoble, France), has for the first time produced microscopic magnetic states, known as “displaced vortex states”, that will allow an increase in the size of MRAMs (which are not deleted when the computer is switched off). The research has been published in Physical Review Letters and Applied Physics Letters. [..]

The “displaced vortex states”, first observed by UAB researchers, are small circular movements of just a few thousandths of a millimetre that form in the tiny zones where the data is stored. The information on hard drives has normally been saved by orientating these zones in specific directions. The zones pointing upwards, for example, codify a 1, and those pointing downwards a 0. The smaller and more compact these zones are, the greater the capacity of the hard drive. But if they are too close together, the magnetic field created by one can affect the neighbouring zone and wipe the data. However, if the field is saved in a whirlpool form, in “vortex state”, it does not leave the tiny zone to which it is confined and does not affect the neighbouring data, thus making it possible for a much larger hard drive capacity.’




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