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We discuss the effect of a magnetic thin‐film ribbon at the surface of a topological insulator on the charge and spin transport due to surface electrons. If the magnetization in the magnetic ribbon is perpendicular to the surface of the topological insulator, this leads to a gap in the energy spectrum of surface electrons. As a result, the ribbon is a barrier for electrons, which yields electrical resistance. We have calculated the conductance of such a structure. The conductance values reveal some oscillations with the length of the magnetized region due to interference of the transmitted and reflected waves. We have also calculated the Seebeck coefficient when the electron flux is due to a temperature gradient. Conductance as a function of the length of a magnetized region at the surface of a topological insulator.

Transmission of charge and spin in a topological‐insulator‐based magnetic structure