Abstract
Topological Matter![Figure][1] Edge current (blue) flows at the boundaries of magnetic domains on a topological insulator PHOTO: SLAC NATIONAL ACCELERATOR LABORATORY Inducing magnetism in a topological insulator can lead to exotic effects. The usual experimental route is to introduce magnetic dopants into the material, but that approach is intricate and creates unwanted disorder. Wang et al. used a simpler technique: They fabricated a bilayer consisting of Bi2Se3, a topological insulator, and EuS, a magnet. The physical proximity of EuS induced magnetism on the surface of Bi2Se3. This approach allowed for the creation of magnetic domains at will and the detection of characteristic current flowing along the domains' edges. Science , this issue p. [948][2] [1]: pending:yes [2]: /lookup/doi/10.1126/science.aaa0508
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