Just how much data can we cram onto a hard disk? In a paper appearing online today in Physical Review Letters, EPFL (Ecole Polytechnique Federale de Lausanne) Professor Harald Brune and his colleagues report what they believe to be the ultimate density limit of magnetic recording.
His group created a self-assembled lattice of non-interacting two-atoms-high islands of cobalt on a single-crystal gold substrate. The islands density -- 26 trillion islands per square inch -- is the highest yet recorded and 200 times the bit density of current computer hard disks. The magnetic properties of the islands are the most uniform ever recorded, and because the islands dont interact with each other, they can each hold one bit of data.
However, its not a storage medium "ready to use" because these records were posted at the uncomfortably cold temperature of -223 C! Above this temperature, thermal excitation starts to reverse the magnetization and the information in the memory gets volatile.
Mary Parlange | EurekAlert!
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18.09.2018 | Penn State
'Optical rocket' created with intense laser light
17.09.2018 | University of Nebraska-Lincoln
Thin-film solar cells made of crystalline silicon are inexpensive and achieve efficiencies of a good 14 percent. However, they could do even better if their shiny surfaces reflected less light. A team led by Prof. Christiane Becker from the Helmholtz-Zentrum Berlin (HZB) has now patented a sophisticated new solution to this problem.
"It is not enough simply to bring more light into the cell," says Christiane Becker. Such surface structures can even ultimately reduce the efficiency by...
A study in the journal Bulletin of Marine Science describes a new, blood-red species of octocoral found in Panama. The species in the genus Thesea was discovered in the threatened low-light reef environment on Hannibal Bank, 60 kilometers off mainland Pacific Panama, by researchers at the Smithsonian Tropical Research Institute in Panama (STRI) and the Centro de Investigación en Ciencias del Mar y Limnología (CIMAR) at the University of Costa Rica.
Scientists established the new species, Thesea dalioi, by comparing its physical traits, such as branch thickness and the bright red colony color, with the...
Scientists have succeeded in observing the first long-distance transfer of information in a magnetic group of materials known as antiferromagnets.
An international team of researchers has mapped Nemo's genome, providing the research community with an invaluable resource to decode the response of fish to...
Graphene is considered a promising candidate for the nanoelectronics of the future. In theory, it should allow clock rates up to a thousand times faster than today’s silicon-based electronics. Scientists from the Helmholtz Zentrum Dresden-Rossendorf (HZDR) and the University of Duisburg-Essen (UDE), in cooperation with the Max Planck Institute for Polymer Research (MPI-P), have now shown for the first time that graphene can actually convert electronic signals with frequencies in the gigahertz range – which correspond to today’s clock rates – extremely efficiently into signals with several times higher frequency. The researchers present their results in the scientific journal “Nature”.
Graphene – an ultrathin material consisting of a single layer of interlinked carbon atoms – is considered a promising candidate for the nanoelectronics of the...
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18.09.2018 | Life Sciences