How
can computer data be reliably stored and read out in future when
computers are getting smaller and smaller? Scientists from Jülich,
Hamburg and Kiel propose to make use of magnetic moments in chains of
iron atoms. This would allow information to be transported on the
nanoscale in a fast and energy-efficient manner over a wide temperature
range, while remaining largely unaffected by external magnetic fields.
The researchers have demonstrated this in both theory and experiment.
Their work could pave the way for further miniaturization in information
processing. The results have been published in the latest edition of
the international scientific journal
Physical Review Letters together
with a recommendation by the editor and an additional commentary.
Up
to now, computers have saved data in magnetic domains (“bits”) on the
hard drive. These domains are already inconceivably small by human
standards: a single 1 terabyte hard drive contains around eight billion
bits. However, in order to make new functionalities possible, computer
components will have to “shrink” even more in future. However, when the
bits lie too close together, their magnetic fields overlap, making the
writing and reading of data impossible. For this reason, new concepts
are required. One method of transporting data on a nanometre scale was
suggested recently by scientists at Forschungszentrum Jülich and the
universities of Hamburg and Kiel.
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