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By shrinking a QR codification to the size of a microbe, researchers from the Vienna University of Technology (TU Wien) and the German-Austrian start-up Cerabyte person shown that the aboriginal of the integer satellite could beryllium connected ceramics, 1 of the oldest and astir durable materials known to humans.
On December 3, the squad secured a Guinness World Record for the world’s smallest QR code. Spanning conscionable astir 2 sq. micrometres, the codification is astir one-third the size of the erstwhile grounds holder and smaller than a azygous bacterium. While the representation is itself an achievement, the team’s methods besides connection a caller mode for humans to store their integer legacy.
The task was led by Paul Mayrhofer, caput of the Institute of Materials Science and Technology astatine TU Wien, on with researchers Erwin Peck and Balint Hajas. And they were motivated by information rot: the inevitable decay of magnetic and physics retention media.
Current retention solutions similar hard drives and magnetic tapes past astir 10 to 30 years. They necessitate a powerfulness proviso to run and beryllium cooled, and request to person the information they store to beryllium copied to caller hardware to forestall loss. The TU Wien squad explored ceramic-based retention arsenic a imperishable and zero-energy alternative.
To make the code, the researchers skipped accepted printing technologies successful favour of atom-scale engineering, successful peculiar a method called focused ion beam milling.
They started with a solid substrate coated successful a 15-nm-thick furniture of chromium nitride, a ceramic typically utilized to overgarment concern cutting tools due to the fact that it’s precise hard and excels astatine resisting vigor and corrosion. Using a watercourse of electrically charged atoms arsenic a knife, the researchers carved the QR codification straight into the ceramic film.
Each idiosyncratic pixel successful the 29 x 29 grid measured lone 49 nm. Because these pixels were astir ten-times smaller than the wavelength of disposable light, the codification is physically intolerable to spot with a modular optical microscope. To verify the work, the squad utilized a calibrated scanning electron microscope astatine the University of Vienna, which uses electrons alternatively of airy to resoluteness tiny structures.
The effort besides proved that ceramic retention could scope an accusation density of 130 bits per quadrate micrometre, meaning a azygous A4-sized ceramic expanse could clasp much than 2 TB of data. This is presently betwixt the astir 20 bits/μm2 of LTO-9 magnetic portion and 1,500-3,000 bits/μm2 of modern hard drives.
Unlike plastic-based tapes oregon magnetic disks, chromium nitride is chemically inert and physically unchangeable and tin past fire, water, and millennia without degrading. And due to the fact that the information has been etched alternatively than stored successful a configuration of electromagnetic states, it doesn’t request powerfulness to persist, perchance sidestepping the request for information centres with ample c footprints.
It does nevertheless necessitate a almighty and costly microscope to retrieve, though the squad has said it’s processing high-speed laser penning and optical speechmaking systems for concern usage for this purpose.
This feat is akin to Microsoft’s Project Silica, wherever researchers are encoding information successful layers of solid utilizing high-speed lasers, again with the purpose of processing high-density information retention that tin past for a agelong time.
