  The gating effect achieved by an ionic liquid and its electric double layer
allows for charge transfer which can be an order of magnitude larger than with
conventional dielectrics. However, the large charged ions also causes
inevitable Coulomb scattering in the conducting channel formed at the
interface, which can limit the carrier mobility enhancement. In this work, we
study the effect of the LaAlO3 thickness on the transport properties in
LaAlO3/SrTiO3 heterostructures by ionic liquid gating. We find that the
transport properties of the LaAlO3/SrTiO3 interface are dominated by the
intrinsic interactions rather than the LaAlO3 thickness and possible effects
from the ions in the liquid. We observe a Kondo effect, which is enhanced while
increasing the gate voltage. We also observe a gate-tunable and
temperature-dependent anomalous Hall effect, which always emerges near the
Kondo temperature. Our experiments pave the way to manipulate the various
magnetic interactions in LaAlO3/SrTiO3 heterostructures.
