A new spin on electron behavior.
Some experiments rewrite the rules of the possible. Others erase them entirely. In a quiet lab in Delft, Netherlands, researchers have pulled off a feat that bends the principles of electronics: transporting spin currents through graphene without using magnets.
This isn’t a parlor trick. It’s spintronics—a field where electrons aren’t just charge carriers but tiny spinning tops. Instead of relying solely on their electric charge, spintronics uses spin, a quantum property with only two settings: up or down. It’s as if every electron carries a miniature compass needle.
In theory, spin currents promise faster, cooler, and smaller chips. In practice, they’ve needed cumbersome hardware—bulky magnets and powerful external fields. Now, that assumption may no longer hold.
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The magnet you don’t see
The Delft team, led by Talieh Ghiasi, took a shortcut through the periodic table. They paired graphene—that one-atom-thick carbon wonder—with a magnetic material called chromium thiophosphate (CrPS₄).
Graphene, on its own, isn’t magnetic. CrPS₄ is, but only internally. It doesn’t emit a visible magnetic field, and that’s the point. Instead, the magnetism quietly leaks into the nearby graphene via a phenomenon called magnetic proximity.
You can picture it like setting a cold spoon next to a warm mug—the spoon starts to heat up without ever being inside the drink. The electrons in the graphene start to feel the magnetic influence without being bombarded by an external field.
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Edge rails for quantum transport
This setup triggers a rare and exotic effect: the quantum spin Hall (QSH) state. It’s not quite magic, but it’s close.
In a QSH state, electrons travel only along the edges of a material, with their spin perfectly aligned. One direction, one spin. The result? No scattering, even in imperfect conditions. Information flows like trains on frictionless rails.
Previously, achieving this effect in graphene required magnetic fields so enormous they were better suited to particle accelerators than consumer electronics. This time, stacking two flat crystals like pancakes did the trick—no coils, no external magnet, no sleight of hand.
A twist in the data
Then came the unexpected.
In addition to the QSH effect, the researchers noticed another quantum oddity: the anomalous Hall effect. It’s a kind of sideways shuffle—electrons drifting perpendicular to the current, without any magnetic field telling them to.
This is more than a curiosity. It happened at room temperature, which suggests real-world applications aren’t just science fiction. Granted, the QSH behavior still requires colder conditions, but it’s a start.
Quantum signals on tightropes
Why does this matter?
Because these spin currents are topologically protected—a phrase that means what it sounds like. They’re immune to most disturbances. Defects, impurities, even tiny cracks in the material—none of it derails the flow.
That’s not just neat. It means quantum information could travel across micrometer distances (think: a thousandth of a millimeter) with minimal loss. That makes them strong candidates for wiring up qubits—the fragile heart of quantum computers—or building memory that doesn’t overheat or degrade.
It’s like sending a message on a tightrope in a storm and knowing it will still arrive intact.
Graphene keeps punching above its weight
Graphene is hardly new—it’s been around since 2004. But its reputation keeps growing. It’s transparent, flexible, strong, and an incredible electrical conductor, all while being just one atom thick.
This new study, published in Nature Communications, adds another line to its resume: spin conduction without magnets.
By gently pressing graphene against a subtle magnetic partner, the researchers unlocked a capability once thought out of reach without heavy machinery. They didn’t invent a new material. They simply exploited what was already there, just beyond our typical scale of observation.
This isn’t the arrival of handheld quantum computers, but it’s a meaningful stride toward making quantum effects useful at room temperature, in chips that don’t need vacuum chambers or massive cooling systems.
And if history is any guide, this won’t be the last surprise graphene has up its sleeve.
Source :
Ghiasi, T.S., Petrosyan, D., Ingla-Aynés, J. et al. Quantum spin Hall effect in magnetic graphene. Nat Commun 16, 5336 (2025). https://doi.org/10.1038/s41467-025-60377-1
Image : Freepik
