Altermagnetism emerges as a third distinct form of magnetic order beyond ferromagnetism and antiferromagnetism
Scientists have identified 'altermagnetism' as a new class of magnetic order, joining the well-known categories of ferromagnetism and antiferromagnetism. Formulated around 2019 and experimentally supported in 2024, altermagnetism features a crystal structure where rotating or mirror-flipping matches sites in cancelling pairs, resulting in zero net external magnetization. However, internally, it possesses electronic structures similar to ferromagnets, such as spin-splitting. This unique duality makes altermagnetic materials highly promising for developing smaller, faster, and more energy-efficient spintronic devices and quantum technologies by reducing interference from stray magnetic fields.
Key Points
- Altermagnetism bridges the gap between ferromagnetism (parallel spins) and antiferromagnetism (cancelling spins).
- It produces no external magnetic field, making devices less susceptible to external disturbances and allowing tighter packing of components.
- The internal electronic structure allows for spin-polarised currents, which is a key requirement for high-speed data storage and logic.
- Manganese telluride (MnTe) and ruthenium dioxide (RuO2) are key materials being studied for these altermagnetic properties.
Exam Facts
- Manganese telluride (MnTe) and Ruthenium dioxide (RuO2) are primary altermagnetic materials.
- Spintronics uses electron spin instead of just charge for information processing.
- Angle-resolved photoemission spectroscopy (ARPES) is used to detect spin-splitting in these materials.
Read it. Retain it. Recall it.
Get spaced-repetition flashcards, daily quizzes and offline access — free on Android.