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The possible realization of dissipationless chiral edge current in atopological insulator / magnetic insulator heterostructure is based on thecondition that the magnetic proximity exchange coupling at the interface isdominated by the Dirac surface states of the topological insulator. Here wereport a polarized neutron reflectometry observation of Dirac electronsmediated magnetic proximity effect in a bulk-insulating topological insulator(Bi$_{0.2}$Sb$_{0.8}$)$_{2}$Te$_{3}$ / magnetic insulator EuS heterostructure.We are able to maximize the proximity induced magnetism by applying anelectrical back gate to tune the Fermi level of topological insulator to beclose to the charge neutral point. A phenomenological model based ondiamagnetic screening is developed to explain the suppressed proximity inducedmagnetism at high carrier density. Our work paves the way to utilize themagnetic proximity effect at the topological insulator/magnetic insulatorhetero-interface for low-power spintronic applications.

Dirac-Electrons-Mediated Magnetic Proximity Effect in Topological Insulator / Magnetic Insulator Heterostructures