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The electronic orders in magnetic and dielectric materials form the domainswith different signs of order parameters. The control of configuration andmotion of the domain walls (DWs) enables gigantic, nonvolatile responsesagainst minute external fields, forming the bases of contemporary electronics.As an extension of the DW function concept, we realize the one-dimensionalquantized conduction on the magnetic DWs of a topological insulator (TI). TheDW of a magnetic TI is predicted to host the chiral edge state (CES) ofdissipation-less nature when each magnetic domain is in the quantum anomalousHall state. We design and fabricate the magnetic domains in a magnetic TI filmwith the tip of the magnetic force microscope, and clearly prove the existenceof the chiral one-dimensional edge conduction along the prescribed DWs. Theproof-of-concept devices based on the reconfigurable CES and Landauer-Buttikerformalism are exemplified for multiple-domain configurations with thewell-defined DW channels.

Quantized chiral edge conduction on reconfigurable domain walls of a magnetic topological insulator