Natural magnetic materials can control light in unprecedented ways

Imagine shining a flashlight into a material and watching the light bend backward-or in an entirely unexpected direction-as if defying the law of physics. This phenomenon, known as negative refraction, could transform imaging, telecommunications, and countless other technologies. Now, a team of scientists has managed to use a natural magnetic material called CrSBr to achieve negative refraction-without the need for complicated artificial structures. The study, published in Nature Nanotechnology,...