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A SLAC-led team reports experimental evidence that manganese telluride exhibits chirality, a magnetic property its researchers say provides robust confirmation of altermagnetism. The findings, published in Science on October 29, 2026, add evidence for a magnetic phase proposed in 2022; possible electronics applications remain a longer-term prospect.
A SLAC National Accelerator Laboratory-led team reported experimental evidence for altermagnetism, a proposed third phase of magnetism, after detecting a distinctive handedness in manganese telluride. The study, published October 29 in Science, identifies a property the researchers say is difficult to explain without altermagnetism and adds evidence to a field that could inform future electronic materials research.
The researchers studied manganese telluride (MnTe), a material long considered an antiferromagnet and more recently proposed as an altermagnetic candidate. Their experiment focused on chirality: a form of handedness in a material’s structure, comparable to the difference between a left hand and its mirror image. The team reports that this property was directly observed in MnTe’s magnetic structure.
To test for chirality, the researchers took the material to the European Synchrotron Radiation Facility in France, where they used controlled, circularly polarized X-rays. The method compares how a sample scatters left- and right-handed X-ray beams. According to lead author Daniel Jost, chiral materials scatter the two differently, while non-chiral materials would respond the same way. The supplied report does not give numerical measurements or detail the size of the observed difference.
The team describes its result as robust experimental confirmation that altermagnetism is real. That wording reflects the researchers’ interpretation of the measurement: the study reports evidence in one candidate material, not a demonstration that every material proposed as an altermagnet has the same properties. The work was led by SLAC and involved researchers associated with the Stanford Institute for Materials and Energy Sciences.
Why Chirality Matters for Devices
The finding addresses a central question in the study of altermagnetism: whether the proposed phase has a measurable feature that distinguishes it from conventional antiferromagnetism. The reported chirality supplies that evidence in MnTe, strengthening the case that magnetic behavior need not fit solely into the familiar ferromagnetic and antiferromagnetic categories.
Researchers are interested in altermagnets because they may combine characteristics associated with both established classes. The SLAC report points to possible applications in quantum technologies, memory devices and data centers. Those are potential uses, not products or capabilities demonstrated by this experiment. The immediate contribution is scientific: a way to test the classification of a candidate material and guide further research into its electronic and magnetic behavior.
If future studies establish how these properties can be controlled and reproduced, altermagnetic materials could become relevant to electronics that use electron spin as well as charge. But the current result does not show a working device, a performance advantage, or a timetable for commercial use.
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From Two Magnetic Classes to Three
In the standard description, ferromagnets have electron spins aligned in the same direction, producing a net magnetic effect. In antiferromagnets, neighboring spins alternate, canceling one another’s overall magnetization. The two categories have shaped physicists’ understanding of magnetic materials for decades.
Researchers began proposing altermagnetism to account for materials that appear to have alternating spins like antiferromagnets while also showing other behaviors associated with ferromagnets. The proposed distinction involves the crystal lattice: the environments around opposite spins are rotated relative to one another. Researchers first used the term “altermagnetism” in 2022. By 2024, Jost said, evidence had accumulated, but the team still sought a direct measurement of chirality in a candidate material.
MnTe became the focus because it had been treated as an antiferromagnet for decades before researchers proposed it might be altermagnetic. The new experiment targets that missing piece of evidence. It does not replace the established definitions of ferromagnetism and antiferromagnetism; instead, the authors argue that MnTe’s measured property supports a distinct class with features that do not fit neatly into the older division.
“We believe our results provide robust experimental confirmation that this third phase – altermagnetism – is real.”
— Daniel Jost, lead author and associate scientist at SLAC and the Stanford Institute for Materials and Energy Sciences
Limits of the MnTe Measurement
The supplied report does not include the paper’s full methods, numerical results, uncertainty estimates or the detailed analysis used to rule out alternative explanations. Those details would be needed to independently assess the measurement beyond the account provided by SLAC. The researchers describe the evidence as conclusive, but that characterization should be distinguished from the reported observation and the team’s interpretation of it.
It also remains unclear from the source material how broadly the result applies across other proposed altermagnetic materials, or how stable and controllable the measured behavior is under different conditions. The report identifies potential application areas, but gives no device demonstrations, engineering benchmarks or commercialization plans. The evidence concerns MnTe and does not itself establish practical performance in memory, data-center or quantum systems.
Further Tests and Materials Research
The next steps are likely to include scrutiny of the published Science study and further experiments on MnTe and other candidate materials. Researchers will need to test whether chirality and related behavior can be reproduced, identify how the material responds under different conditions, and clarify which observations distinguish altermagnets from conventional antiferromagnets.
For applications, the key milestones would be showing that researchers can reliably manipulate the relevant properties and incorporate them into devices. The SLAC report does not announce a specific follow-up experiment, device project or timeline. For now, the immediate development is the team’s reported measurement and the paper’s contribution to the experimental case for altermagnetism.
Key Questions
What did the SLAC-led team report finding?
The researchers reported chirality in manganese telluride, detected by comparing how the material scattered left- and right-handed circularly polarized X-rays. They say the result supports classifying MnTe as an altermagnet.
What is altermagnetism?
Altermagnetism is a proposed magnetic phase in which spins alternate, as in antiferromagnets, while the arrangement of the surrounding crystal lattice differs between opposite spins. Researchers proposed the term in 2022 to describe materials with behavior not neatly covered by the two established categories.
Does this mean altermagnetic electronics are available?
No. The study is a materials-science finding, not a report of a completed device. Quantum technologies, memory and data centers are potential application areas cited by SLAC; the source does not report a product or commercial timeline.
What remains uncertain?
The supplied account does not provide numerical measurements or full methodological details, and it does not establish whether the result applies to other candidate materials. Device performance and the practical control of altermagnetic properties also remain unreported.
Source: www6.slac.stanford.edu
