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Progress toward new storage media
Date:10/27/2008

This press release is available in German.

In this information age, increased storage capacity is a central challenge for science and technology. A team of German and Italian researchers has pursued this by exploring the concept of "nanostructured storage domains". As the scientists, led by Massimiliano Cavallini at the National Research Council (CNR) in Bologna (Italy) and Mario Ruben at the Forschungszentrum Karlsruhe (Germany), report in the journal Angewandte Chemie, they have been able to produce reliable nanopatterns of a spin-transition compound on silicon oxide chips. This is a decisive step toward a new generation of molecular storage media in which binary data are stored by the "switching" of electron spins.

Currently, computer hard drives store data by magnetizing the surface of a rotating disk. Each "storage cell" has an "address", so that stored data can be accessed directly. To increase storage capacity, the individual magnetic domains are made smaller and smaller; we are however getting close to the limit. Thermal excitation occasionally causes some of the magnetic particles to flip in the other direction. When the domains are very small, the entire cell can rapidly lose its magnetization.

To achieve higher information density, we could change to other switchable material properties, such as the transition between two spin states. For example, iron(II) compounds can exist in either a high- or a low-spin state. "Switching" (flipping) can be controlled by changes in temperature, pressure, or electromagnetic radiation.

In addition to two distinguishable states to represent 0 and 1, data storage also requires a unique "address" for each storage location that can be identified by the optical writing and reading units of the computer. This requires an interface that makes the nanoscopic spin-state transitions of the molecular switching
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Contact: Massimiliano Cavallini
m.cavallini@bo.ismn.cnr.it
39-051-639-8519
Wiley-Blackwell
Source:Eurekalert  

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