Research team at Kiel University saves information on a single molecule
Over the past few years, the building blocks of storage media have gotten ever smaller. But further miniaturization of the current technology is hindered by fundamental limits of quantum mechanics. A new approach consists in using so-called spin-crossover molecules as the smallest possible storage unit. Similar to normal hard drives, these special molecules can save information via their magnetic state. To do so, they have to be placed on surfaces, which is challenging without damaging their ability to save the information. A research team from Kiel University has now not only managed to successfully place a new class of spin-crossover molecules onto a surface, but they have also used interactions which were previously regarded as obstructive to improve the molecule’s storage capacity. The storage density of conventional hard drives could therefore theoretically be increased by more than one hundred fold, and data carriers could be made significantly smaller. The scientists have published their findings in the scientific journal Nano Letters.
Is a switch on or off? Is a statement true or false? Is an answer yes or no? The differentiation between two possibilities is the smallest piece of information that a computer can save. Bits (a word comprised of ‘binary’ and ‘digit’), as the smallest electronic storage unit, are the basic building blocks for all information stored on our hard drives. They are presented as a sequence of two different symbols like 0 and 1, the so-called binary code. Over the past few years, storage media have become ever smaller while their capacity to store information has increased. One Bit on a hard drive now only requires a space of around 10 by 10 nanometres. This is still too big for miniaturising components, however.
“The technology that is currently being used to store data on hard drives now reaches the fundamental limits of quantum mechanics due to the size of the Bit. It cannot get any smaller, from today’s perspective,” says Torben Jasper-Tönnies, doctoral researcher in Professor Richard Berndt’s working group at Kiel University’s Institute of Experimental and Applied Physics. He and his colleagues used a single molecule, which could be employed to encode a Bit, to demonstrate a principle which might just enable even smaller hard drives with more storage in the future. “Our molecule is just one square nanometre in size. Even with this alone, a bit could be encoded in an area hundred times smaller than what is nowadays required,” says his colleague, Dr Manuel Gruber. This would be another step towards shifting the limits of quantum physics in storage technology.
When Bits become Trits
The molecule which the interdisciplinary research team from the Kiel Collaborative Research Centre (CRC) 677 “Function by Switching” uses can not only assume two different magnetic states, but when attached to a special surface, it can also change its connection to the surface. It can then be switched between a high and low magnetic state, and turned by 45 degrees. “When transferred onto storage technology, we would be able to depict information on three states – those being 0, 1 and 2,” explained Jasper-Tönnies. “As a storage unit, we wouldn’t have a Bit, we would have a Trit. Binary code would become trinary code.”
The challenge for the researchers from Chemistry and Physics was in finding a suitable molecule and a suitable surface, as well as using the correct method to connect the two together in a way that would still allow them to work. “Magnetic molecules, so-called spin-crossover molecules, are very sensitive and easily damaged. We needed to find a way to firmly attach the molecule to the surface without affecting its switching ability,” explained Gruber.
Perfect combination of molecule and surface
Their experiments finally paid off: Chemists from Professor Felix Tuczek’s working group at the Institute of Inorganic Chemistry synthesized a magnetic molecule of a special class (a so-called Fe(III) spin crossover molecule). Physicists Jasper-Tönnies, Gruber and Sujoy Karan were able to deposit this molecule on a copper nitride surface by means of evaporation. Using electricity, it can be switched between different spin states, and also between two different directions (in the so-called low-spin state). The fine tip of a scanning tunnelling microscope (STM) acts as a hard drive’s reading and writing head in their experiments. This piece of equipment allows the molecule to not only be “written” as a storage medium, but also to be “read” using electricity.
Before these molecules can be used as a data storage on an industrial level further investigation must be carried on. Indeed, the proof of principle is demonstrated using a rather voluminous setup (STM) and further work is required to integrate such a molecular memory on a small chip.
The Latest on: Molecular hard drive
- Molecular eraser enables better data storage and computers for AIon November 27, 2019 at 5:02 am
Considerations for carbon The findings present potential applications from smaller hard drives to more efficient data centres, a need and a new reality for our data-driven climate-concerned world.
- 2020 Vision: Predictions of What May Shape Precision Medicineon November 15, 2019 at 5:27 am
In particular, innovations in research techniques like antigen mapping, B- and T-cell receptor sequencing, multi-omics and spatial analysis will drive these new discoveries ... in order to get ...
- How Will We Store Three Septillion Bits of Data? Your Metabolome May Have the Answeron July 17, 2019 at 7:03 am
Fundamentally, the study hopes to encourage people to think more broadly and creatively about the range of possible biological hard drives. “Research like this challenges what people see as being ...
- Molecular Thumb Drives: Storing Images in Moleculeson July 8, 2019 at 7:48 am
Specifically, the study wanted to tests if artificial metabolomes could be a data storage option—more like a molecular thumb drive. Brown University ... (Image Credit: BrownUniversity.edu) “It’s not ...
- Researchers have stored data inside a molecular thumb driveon July 4, 2019 at 7:22 am
Researchers at Brown University have announced that they have made a big step towards molecular storage systems that can hold ... using DNA that can hold vastly more data than current hard drives. The ...
- Molecular thumb drives: Researchers store digital images in metabolite moleculeson July 3, 2019 at 4:44 pm
and there is growing interest in using DNA in engineered data storage devices that can hold vastly more data than our current hard drives. But new research shows that DNA isn't the only game in town ...
- Dynamic aspirin: Molecular vibrations drive electrons over large distanceson January 31, 2019 at 1:18 pm
Aspirin is not only an important drug but also an interesting physics model system in which molecular vibrations and electrons are coupled in a particular way. For the first time, X-ray experiments in ...
via Google News and Bing News