A naturally occurring stack of crystals allows computer memory to flip its magnetic state without the need for any external magnets.
April 24, 2026
Original Paper
Proximity Magnetism in Mn(Bi,Sb)2Te4-(Bi,Sb)2Te3/MnTe Natural Heterostructures
arXiv · 2604.18935
The Takeaway
Spintronic devices use the spin of electrons to store data, but they usually require bulky magnets to function. This specific heterostructure creates its own internal magnetic environment through a proximity effect. A very low electric current is all that is needed to switch the data state of the material. This removes one of the biggest hurdles to making ultra-dense and low-power computer storage. Future devices could use these natural layers to pack more memory into smaller spaces while staying cool.
From the abstract
Magnetic topological insulators and their heterostructures provide great opportunities in coupling band topology with nontrivial spin configuration for enhanced spintronic device performance as well as designing totally new magnetoelectric systems and functionalities. We find that Mn interdiffusion from MnTe when interfaced with (Bi,Sb)2Te3 stabilizes as self-organized Mn(Bi,Sb)2Te4 septuple lamellae amongst alternating (Bi,Sb)2Te3 quintuple layers, as observed using scanning transmission electr