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1Clear out junk files and repair common Windows errors2Scan for outdated or missing drivers - takes under a minute3Repair Windows errors before they cause bigger problemsA Nature Nanotechnology study published 14 October 2026 shows that a gate voltage can slide graphene layers into a different stacking arrangement, switching tetralayer graphene between a non-magnetic or paramagnetic state and a ferromagnetic state. The change is first-order and non-volatile: after the gate-writing condition is removed, the selected structural and magnetic state can remain.
What the 2026 study discovered
Tetralayer graphene has four atom-thin carbon sheets. In the reported device, changing the gate voltage did more than add or remove charge. It drove a structural transition in which one layer registry slid laterally relative to another. The sample switched between a Bernal-dominant configuration and a mixed configuration containing Bernal and rhombohedral regions.
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The mixed state was the ferromagnetic one, while the Bernal-dominant state was non-magnetic or paramagnetic in the transport measurements. Because the two configurations are separated by a first-order transition, the device can retain either state, creating a bistable electrical switch without rebuilding or chemically modifying the graphene.
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Clear out junk files and repair common Windows errorsFree Scan →Scan for outdated or missing drivers - takes under a minuteDriver Scan →Repair Windows errors before they cause bigger problemsFix Now →The paper appeared in Nature Nanotechnology on 14 October 2026. A public preprint posted on 30 September 2025 described the same behavior as non-volatile switching between a paramagnet and a ferromagnet caused by gate-induced sliding.
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“The structural phase transition induces a non-volatile switching between a non-magnetic and a ferromagnetic phase,” the Nature abstract states.
Why stacking matters in four graphene layers
Bernal and rhombohedral registries
Graphene sheets are not electrically equivalent when their atoms are laterally offset in different ways. Bernal tetralayer graphene has an ABAB sequence, while an ideal rhombohedral stack has an ABCA sequence. Those registries produce different electronic bands, so the same carbon sheets can support different collective phases depending on how the layers line up.
The experiment did not switch between two perfectly uniform textbook crystals. Its observed states were a Bernal-dominant state and a rhombohedral–Bernal mixed state, indicating that real devices can contain regions of more than one stacking polytype.
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Gate voltage as a mechanical control
Electrostatic gates change carrier density and the out-of-plane displacement field. In this device, that electrical bias also changed the energetic balance between stacking arrangements. A layer registry shifted laterally, producing a first-order sliding transition. Sweeping the gate through the transition generated bistability: more than one structural state could be stable at the same broad region of the gate-voltage phase diagram, depending on the prior state.
How the magnetic switch works
The ferromagnetic state is tied to the mixed stacking
Low-temperature transport identified the rhombohedral–Bernal mixed state with a ferromagnetic response. Returning the device to its Bernal-dominant configuration removed that response, leaving a non-magnetic or paramagnetic state. The result is therefore a structural route to electrical magnetic control: the gate selects layer registry, and registry selects the observed phase.
This differs from approaches that rely on a magnetic field or on adding magnetic atoms. The control variable here is the geometry of the van der Waals stack, adjusted electrostatically.
Non-volatile does not mean room-temperature memory
Non-volatile means the selected state persists after the gate-writing condition is changed; it does not establish operation without continuous cryogenic control. The published evidence is a low-temperature transport demonstration. The accessible study materials do not provide a safe single value for switching temperature, coercive field, switching energy, or endurance over repeated cycles.
What the anomalous Hall effect reveals
The ferromagnetic phase was accompanied by an anomalous Hall effect, an extra transverse voltage associated with broken time-reversal symmetry rather than the ordinary Hall response alone. Reversing the displacement-field polarity reversed the sign of the anomalous Hall signal.
The authors say this sign behavior suggests that the Hall signal may originate at domain boundaries between Bernal and rhombohedral regions. That is a proposed microscopic explanation, not a conclusively assigned source. Interfaces could have electronic states or Berry-curvature effects different from either bulk-like stacking region, allowing the boundaries to dominate the measured Hall voltage.
State-by-state comparison
| Feature | Bernal-dominant state | Rhombohedral–Bernal mixed state |
|---|---|---|
| Typical stacking description | Mostly ABAB-like registry | Coexisting Bernal and rhombohedral regions |
| How it is selected | Gate-controlled electrostatic conditions favoring Bernal stacking | Gate-induced sliding into the mixed stacking configuration |
| Magnetic behavior reported | Non-magnetic or paramagnetic | Ferromagnetic |
| Hall signature | No ferromagnetic anomalous Hall phase reported | Anomalous Hall effect; its sign reverses with opposite displacement fields |
| Persistence | Participates in a bistable, non-volatile structural switch | Participates in the same bistable, non-volatile switch |
What was actually measured
The team used low-temperature electrical-transport measurements. Gate sweeps exposed hysteresis or bistability associated with the stacking transition, while longitudinal and Hall transport supplied evidence for the magnetic phases. This is an inference from electronic response, not a direct image of every sliding layer during operation.
The available reports do not establish the following engineering figures:
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- A coercive magnetic field.
- Energy consumed by one gate-writing event.
- A guaranteed number of switching cycles or long-term endurance.
- Room-temperature retention or operation.
Those quantities require the full article’s figures and methods rather than a single headline result.
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Why the result matters for “slidetronics”
Geometry becomes an electronic control knob
The experiment demonstrates that layer registry itself can be electrically selected. Magnetism emerges or disappears when the stack changes structure, without reconstructing the device or introducing a magnetic dopant.
One device can hold two phases
First-order switching and bistability provide the basis for non-volatile state selection. A future device could write a structural state with a gate pulse and read it electrically, although the present work does not establish a practical memory architecture.
Interfaces may be as important as the layers
The displacement-field-dependent Hall sign makes domain boundaries experimentally significant. If boundaries carry the dominant Hall response, controlling their density, position and reproducibility will be as important as controlling the average stacking order.
Kenji Yasuda’s institutional summary places the finding within a broader “slidetronics” program that uses electrostatic control of van der Waals layer sliding to tune quantum phases. The tetralayer result extends that strategy to a switch between magnetic and non-magnetic transport states.
What comes next
Reproducibility is helped by the authors’ release of raw data and analysis code through Zenodo (DOI 10.5281/zenodo.22239272, version published 2 September 2026). Independent work will need to determine how uniformly the transition occurs, how domain boundaries evolve, and whether the effect survives at temperatures useful for applications.
For now, the strongest conclusion is specific: in a low-temperature tetralayer-graphene device, gate-induced interlayer sliding changes the stacking polytype and toggles a ferromagnetic anomalous-Hall phase on and off. It is a laboratory demonstration of electrically controlled structural magnetism, not yet a room-temperature commercial memory technology.
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