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1Repair Windows errors before they cause bigger problems2Scan for outdated or missing drivers - takes under a minute3Clear out junk files and repair common Windows errorsAltermagnetism is a magnetic state in which a material’s atomic magnetic moments cancel overall, yet the symmetry of its crystal can still produce spin-split electronic bands. It combines compensated magnetism familiar from antiferromagnets with spin-dependent electronic behavior often associated with ferromagnets—without the net magnetization of a conventional ferromagnet.
What makes a material altermagnetic?
Two properties are central: the magnetic moments are compensated, so they produce no net magnetization, and the electronic bands can have alternating spin splitting because of the material’s crystal and spin symmetries. Nature Reviews Materials describes altermagnets as having “non-relativistic alternating spin splitting in the band structure and collinear compensated magnetic moments in real space.” Nature Reviews Materials (2025)
In a simple picture, neighboring moments point in opposite directions and cancel in the material as a whole. But compensation does not require the electronic structure to behave identically for opposite spins at every point in momentum space. In altermagnets, symmetry can permit alternating spin splitting: electronic bands separate according to spin in a pattern that changes across the band structure.
How does altermagnetism compare with other magnetic states?
| Magnetic state | Net magnetization | Spin splitting | Practical implication |
|---|---|---|---|
| Ferromagnet | Nonzero: magnetic moments align to produce an overall magnetization. | Spin-dependent band behavior is associated with its magnetic order. | Can provide spin-dependent effects, but a net magnetization can produce stray fields. |
| Conventional antiferromagnet | Zero when opposing moments cancel. | In the familiar conventional-antiferromagnet picture, opposite spins are not split in the same symmetry-permitted alternating pattern described for altermagnets. | Compensation avoids a net magnetization, but does not by itself establish the altermagnetic form of spin-dependent response. |
| Altermagnet | Zero when opposing moments cancel. | Alternating spin splitting can arise from crystal and spin symmetries despite compensated moments. | May combine spin-dependent responses with vanishing stray fields; device performance remains a research question. |
The comparison is about the underlying magnetic and electronic properties, not a guarantee of device behavior. Researchers are interested in whether altermagnets could offer useful spin-dependent effects without the stray fields associated with net magnetization; that motivation is not evidence of commercial performance. Nature Reviews Materials (2025) and Nature (published online January 2026)
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What has been observed experimentally?
Manganese telluride thin films
An American Physical Society account published on 18 January 2024 described measurements of manganese telluride films. Below 267 K, the films exhibited zero net magnetization and a spin-split band structure. The researchers interpreted those findings as compelling evidence for altermagnetism in that material. The account noted that the group planned further characterization using spin-resolved angle-resolved photoemission spectroscopy (ARPES). APS Physics Magazine (18 January 2024)
The study used thin films, not thick blocks. The APS account also notes a measurement challenge: conventional ARPES is typically surface-sensitive. The result is evidence tied to a particular material and experiment, not proof that every proposed altermagnet has been confirmed.
Evidence across materials
In 2024, Nature summarized two papers reporting experimental evidence of spin splitting in materials classed as altermagnets. Experimental work is developing, so distinguish observations in specific materials from predictions about a broader class. APS Physics Magazine
What materials are candidates—and what remains uncertain?
A paper published in National Science Review on 22 February 2025 reported 50 candidate materials identified through an AI-assisted search and confirmed with first-principles electronic-structure calculations. The candidates span metals, semiconductors, and insulators. The authors also discuss predicted anomalous Hall, anomalous Kerr, and topological properties. These are computationally confirmed candidates, not 50 materials all demonstrated experimentally. National Science Review (22 February 2025)
RuO₂ is a contested case rather than an uncontested example. The 2025 Nature Reviews Materials review cites reports interpreting spectroscopic results as altermagnetic signatures, as well as reports of a nonmagnetic ground state and an absence of magnetic order. Its status should therefore be presented with that disagreement in view. Nature Reviews Materials (2025)
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Why are researchers interested in altermagnetism?
Altermagnets are relevant to spintronics because they may combine spin-dependent electronic responses with compensated magnetism. Proposed research directions include high-density magnetic memories and terahertz nano-oscillators, as well as work in magnonics, ultrafast photonics, and phononics. These are prospective applications, not evidence that altermagnetic memory products or other consumer devices are commercially available. Nature Reviews Materials (2025)
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