  The work presents an experimental demonstration of time-reversal asymmetry of
electron states propagating along boundary separating areas with opposite
magnetic fields. For this purpose we have fabricated a hybrid
ferromagnet-semiconductor device in form of a Hall cross with two ferromagnets
deposited on top. The magnets generated two narrow magnetic barriers of
opposite polarity in the active Hall area. We have observed that if the signs
of the barriers are reversed, the bend resistance changes its sign. Using the
Landauer-Buttiker theory, we have demonstrated that this is a direct
consequence of asymmetric transmission of the "snake" and the "cycloidal"
trajectories formed the boundary separating the regions with opposite magnetic
field directions.
