P-wave magnets could save five orders of magnitude of energy.
In a laboratory at MIT, physicists have observed a form of magnetism that theory long predicted but experiment had never confirmed — a spiral arrangement of electron spins in synthetic nickel iodide crystals that blends the behaviors of ordinary magnets and their opposites. The discovery, published in Nature, is not merely a curiosity of quantum physics; it opens a credible path toward electronics that manipulate the spin of electrons rather than their charge, potentially transforming how humanity stores and moves information. At a moment when the energy demands of computing are rising sharply, the promise of reducing that consumption by a factor of one hundred thousand places this finding in a lineage of discoveries that quietly rewrite what is possible.
- For the first time, researchers have directly observed p-wave magnetism — a hybrid spiral spin pattern that had existed only in theory until nickel iodide crystals made it real.
- The tension lies in a paradox at the heart of the material: its spin patterns cancel out at the macro scale, yet remain precisely controllable at smaller scales, a combination that conventional magnetic materials cannot offer.
- By applying nothing more than a small electric field, the MIT team demonstrated they could switch spin states on demand, transforming an exotic quantum phenomenon into something engineers might one day wire into a circuit.
- The stakes are sharpened by context — AI-driven computing is consuming energy at record rates, and spintronics devices built on this principle could theoretically use one hundred thousand times less power than today's electronics.
- The discovery remains confined to the laboratory, requiring precision-grown flakes and sophisticated instrumentation, with the road from fundamental proof to manufacturable chip still long and uncharted.
At MIT, physicists have coaxed a synthetic crystal into revealing a form of magnetism never directly observed before. The material, nickel iodide, is grown in a high-temperature furnace into ultra-thin two-dimensional flakes. When the researchers shone corkscrew-shaped polarized light across the crystal, they detected something unexpected: the electrons' spins arranged themselves in mirrored spirals — a pattern physicists call p-wave magnetism.
The discovery confirms a theoretical prediction. Physicist Riccardo Comin explains that his team identified nickel iodide as a promising candidate and set out to test the idea experimentally. What they found was a hybrid form of magnetism combining two seemingly opposite behaviors: unlike ordinary magnets, where all spins align, or antiferromagnets, where spins cancel perfectly, p-wave magnetism creates spiral spin patterns that cancel the overall magnetic field at large scales while remaining controllable at smaller ones.
Crucially, the team could manipulate this magnetism with a small electric field alone — switching spin states by adjusting voltage. This opens a door to spintronics, a field where devices would manipulate electron spins rather than electrical charges to store data, perform calculations, and transfer energy. Colleague Qian Song points to the practical stakes: p-wave magnets could theoretically reduce energy consumption by five orders of magnitude, a prospect that feels transformative at a time when artificial intelligence is pushing computing's energy demands to new heights.
The technology remains firmly in the laboratory for now, requiring precision-grown crystals and sophisticated measurement equipment. No spintronics chips are in production, and the path from discovery to consumer device is long. But the fundamental proof is established: a new form of magnetism exists, can be synthesized, and responds to electrical control — a stepping stone toward electronics built on principles unlike any that have come before.
In a laboratory at MIT, physicists have coaxed a synthetic crystal to reveal a form of magnetism that has never been directly observed before. The material is nickel iodide, a two-dimensional compound grown in a high-temperature furnace into ultra-thin flakes. When the researchers shone polarized light—the kind that spirals like a corkscrew rather than oscillating in a simple wave—across the crystal, they detected something unexpected: the electrons' spins arranged themselves in mirrored spirals, a pattern that physicists call p-wave magnetism.
The discovery builds on theoretical work that predicted such a thing might exist. Riccardo Comin, a physicist at MIT, explains that the team recognized nickel iodide as a promising candidate and decided to test the prediction experimentally. What they found was a hybrid form of magnetism that combines two seemingly opposite behaviors. In ordinary magnets, all the electron spins point the same direction, like compasses aligned north. In antiferromagnets, the spins cancel each other out perfectly at the large scale. P-wave magnetism does something stranger: it creates spiral patterns of different spin states that ultimately cancel the overall magnetic field, yet remain controllable at smaller scales.
What makes this discovery more than a curiosity is that the researchers could manipulate the magnetism with nothing more than a small electric field. By adjusting the voltage, they could switch the spin states and alter the material's magnetic properties. This kind of control opens a door to an emerging field called spintronics, where instead of moving electrical charges through circuits—the way conventional electronics work—devices would manipulate electron spins to store information, perform calculations, or transfer energy. The potential payoff is enormous: systems built this way could be far more energy-efficient than what we use today.
Qian Song, also at MIT, emphasizes the practical implications. A new class of magnetic memory devices could emerge from this work—ultrafast, compact, and nonvolatile, meaning they would retain data without constant power. In an era when artificial intelligence is driving energy consumption to unprecedented levels, the efficiency gains matter. Song notes that p-wave magnets could theoretically reduce energy use by five orders of magnitude, a reduction so dramatic it borders on the transformative.
The catch is that this technology remains firmly in the laboratory. The current setup requires careful calibration and special conditions to function. The nickel iodide flakes must be produced with precision, and the measurements demand sophisticated equipment. No one is manufacturing spintronics chips yet, and the path from discovery to consumer device is long and uncertain. But the fundamental proof is now in hand: a new form of magnetism exists, it can be created in a material we can make, and it responds to electrical control. The research, published in Nature, represents a stepping stone toward electronics that operate on principles fundamentally different from those that have dominated the field for decades.
Citas Notables
We showed that this new form of magnetism can be manipulated electrically. This breakthrough paves the way for a new class of ultrafast, compact, energy-efficient, and nonvolatile magnetic memory devices.— Qian Song, MIT physicist
P-wave magnets could save five orders of magnitude of energy. Which is huge.— Qian Song, MIT physicist
La Conversación del Hearth Otra perspectiva de la historia
Why does it matter that we found this particular type of magnetism now, in this moment?
Because we've been looking for ways to make electronics more efficient, and we keep hitting walls with conventional approaches. This shows a completely different path forward—one where we don't move charges around, we move spins. That's not just incremental; it's a different language for the machine.
But you said it's still in the lab. How far away is this from actually being useful?
Years, probably. Maybe a decade or more before you see it in a device. Right now it needs perfect conditions, careful setup. But the principle works. We've proven the concept. That's the hard part.
The five orders of magnitude energy savings—is that realistic, or is that theoretical?
It's theoretical, based on the physics of how spintronics would work compared to conventional electronics. But the gap between theory and practice in magnetism has been closing. We've been wrong before, but we've also been right.
What would change if this actually made it into, say, a phone or a data center?
Everything would run cooler and longer on less power. Data centers consume enormous amounts of electricity. If you could cut that by orders of magnitude, you're talking about real environmental impact, real cost savings. That's why people are paying attention.
Is nickel iodide the only material that can do this, or is it just the first one we found?
It's the first one we've confirmed. There are probably others. This discovery is really about understanding the physics well enough to recognize it elsewhere and engineer it deliberately.