Imagine a soccer ball so small that 10 trillion of them sitting side by side would barely stretch across a human hair. Inside a lab in Austria, scientists have been experimenting with just such a molecule — shaped like a tiny soccer ball and made entirely of carbon atoms — and discovered it can become a surprisingly powerful magnet.
Researchers at the Institute of Science and Technology Austria (ISTA) found that running an electric current through certain carbon-based molecules produces magnetic fields strong enough to detect at the nanoscale. Their work, published in the journal Nature Communications, could point toward a new generation of ultra-small electronic devices.
The team was led by Professor Latha Venkataraman and Ph.D. student Wanzhuo Shi. While studying how electricity flows through ring-shaped molecules called nanohoops, they uncovered a quantum effect that makes the current loop around the ring's center, creating a localized magnetic field — similar to how wrapping copper wire into a coil amplifies the magnetic field around it.
"A key question was whether any current would flow through the hoop or if all the current simply bypassed it and went just from one electrode to the other," Shi explained. Through theoretical modeling, he found that certain molecular shapes — particularly circular rings and spherical cages — naturally amplify circulating currents, strengthening the magnetic field they produce.
To understand the scale of what they're aiming for, Venkataraman asked Shi a striking question during their research discussion: How strong would a magnetic field need to be to erase a hard drive? The answer was about 0.5 tesla — roughly half the field strength used to lift an entire car in a junkyard. For comparison, a typical fridge magnet measures just five millitesla. Most single-molecule magnets studied so far produce fields far too weak to detect with today's instruments.
But the ISTA team's organic molecules show promise. Unlike traditional electromagnets that need metal coils and iron cores, these carbon-and-hydrogen structures are simple and entirely organic, yet their geometry boosts the magnetic effect through quantum mechanics rather than bulk materials.
The findings are still theoretical — the team used computer modeling rather than lab experiments. Yet they identify a physical phenomenon that could make single-molecule magnets practical for nanoelectronics, where devices are built from individual molecules rather than silicon chips. Such technology could one day allow engineers to write data onto hard drives using nothing but a tiny current through a single molecule at a sensor tip.
The timing of the research caught some attention — the paper appeared just as the FIFA World Cup final approached, prompting jokes among the team about their soccer-ball-shaped molecule being in the spirit of the occasion. More importantly, the work offers a concrete direction for designing molecules that work as miniature electromagnets, potentially opening doors to faster, smaller electronics down the road.