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The surface of topological insulators is proposed as a promising platform forspintronics and quantum information applications. In particular, when time-reversal symmetry is broken, topological surface states are expected to exhibita wide range of exotic spin phenomena for potential implementation inelectronics. Such devices need to be fabricated using nanoscale artificial thinfilms. It is of critical importance to study the spin behavior of artificialtopological MBE thin films associated with magnetic dopants, and with regardsto quantum size effects related to surface-to-surface tunneling as well asexperimentally isolate time-reversal breaking from non-intrinsic surfaceelectronic gaps. Here we present observation of the first (and thorough) studyof magnetically induced spin reorientation phenomena on the surface of atopological insulator. Our results reveal dramatic rearrangements of the spinconfiguration upon magnetic doping contrasted with chemically similarnonmagnetic doping as well as with quantum tunneling phenomena in ultra-thinhigh quality MBE films. While we observe that the spin rearrangement induced byquantum tunneling occurs in a time-reversal invariant fashion, we presentcritical and systematic observation of an out-of-plane spin texture evolutioncorrelated with magnetic interactions, which breaks time-reversal symmetry,demonstrating microscopic TRB at a Kramers' point on the surface.

Magnetically induced spin reorientation on the surface of a topological insulator (a surface magnetic topological insulator MBE film)