  Magnetic skyrmions are compact chiral spin textures that exhibit a rich
variety of topological phenomena and hold potential for developing high-density
memory devices and novel computing schemes driven by spin currents. Here, we
demonstrate room temperature interfacial stabilization and current-driven
control of skyrmion bubbles in the ferrimagnetic insulator Tm3Fe5O12 (TmIG)
coupled to Pt. We track the current-induced motion of individual skyrmion
bubbles. The ferrimagnetic order of the crystal together with the interplay of
spin-orbit torques and pinning determine the skyrmion dynamics in TmIG and
result in a strong skyrmion Hall effect characterized by a negative deflection
angle and hopping motion. Further, we show that the velocity and depinning
threshold of the skyrmion bubbles can be modified by exchange coupling TmIG to
an in-plane magnetized Y3Fe5O12 layer, which distorts the spin texture of the
skyrmions and leads to a directional-dependent rectification of their dynamics.
This effect, which is equivalent to a magnetic ratchet, is exploited to control
the skyrmion flow in a racetrack-like device.
