MIT engineers have developed a magnetic transistor that could transform electronics by combining logic and memory into a single device. In their announcement through MIT News, the team explained how they replaced the usual silicon channel with a two-dimensional magnetic semiconductor, creating a component that switches current using not just charge but also the spin of electrons. The result is a transistor that can perform logic while also storing information, a shift that could make future circuits both smaller and more energy efficient.
Traditional transistors rely on voltage thresholds to switch between on and off states, but they waste power as voltages approach physical limits. By integrating magnetism into the process, the new transistor operates at lower energy levels and with greater stability. It essentially folds memory directly into the hardware, something conventional silicon devices cannot do without adding extra chips.
How it works and why it matters
The breakthrough relies on chromium sulphur bromide, a layered magnetic material that stays stable even when thinned to just a few atoms. When its magnetic state flips, the material’s conductivity changes, giving engineers a controllable on/off switch. That switch not only drives current but also “remembers” its magnetic state, meaning it doubles as memory.
In tests, the team demonstrated switching effects ten times stronger than in previous magnetic devices. That strength makes the transistor more practical for integration into real circuits, where weak signals usually fail under noisy conditions. Because the material can be controlled electrically, not just with an external magnet, it also fits with modern chip design, where billions of transistors must be packed into small, efficient architectures.
If this approach can scale, it could cut the number of components needed in everything from mobile phones to data centres. Instead of shuttling information back and forth between processor and memory, devices could process and store data in the same place, reducing heat and saving energy. For technologies like AI and edge computing, where efficiency is critical, this would be a major advantage.
There are hurdles, though. Lab devices are one thing; producing millions of identical transistors in a fabrication plant is another. Manufacturing methods for silicon are deeply entrenched, and introducing magnetic materials will require new processes, new standards and rigorous testing for endurance. Magnetic states can degrade under stress, so proving long-term reliability will be crucial.
Still, the discovery signals that the frontier of electronics may not be limited to smaller silicon anymore. Spintronics, the field that combines spin and charge, has long promised breakthroughs, but practical devices were elusive. Now, with a working magnetic transistor that shows both strength and stability, the field is moving closer to real-world impact.