For nearly 90 years, scientists believed magnetism was limited to two categories: ferromagnetism and antiferromagnetism. However, researchers at SLAC National Accelerator Laboratory have now confirmed a third type called altermagnetism, which combines the stability of antiferromagnets with the information-carrying efficiency of ferromagnets. Using specialized X-ray techniques at the European Synchrotron Radiation Facility, the team detected a chiral magnetic signature in manganese telluride (MnTe), a material previously classified as an antiferromagnet. This chiral signature, which indicates handedness in the material's magnetic structure, is a key characteristic of altermagnetism that distinguishes it from conventional antiferromagnets. The discovery could revolutionize spintronics, a field focused on using electron spin rather than electrical charge to process information. Unlike ferromagnets, which are vulnerable to external magnetic fields, and antiferromagnets, which are difficult to read, altermagnets offer zero net magnetization for stability while still enabling efficient spin-polarized currents for data retrieval. This unique combination could lead to faster computers, more energy-efficient data centers, and breakthroughs in quantum technology. The research, published in Science, represents a significant step in understanding magnetic materials and opens new avenues for developing advanced electronic devices. The team conducted experiments in 2024 and repeated them in 2025 to confirm their findings, demonstrating the robustness of the evidence for altermagnetism. The discovery has been hailed as a major advancement in fundamental physics with potential practical applications in next-generation computing technologies.

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