# Tunable magnetic interactions in LaAlO3/SrTiO3 heterostructures by ionic liquid gating

## TL;DR

This study demonstrates that ionic liquid gating can effectively tune magnetic interactions in LaAlO3/SrTiO3 heterostructures, revealing gate-dependent Kondo and anomalous Hall effects, independent of LaAlO3 thickness.

## Contribution

It shows that magnetic interactions can be manipulated via ionic liquid gating without significant influence from LaAlO3 thickness or ionic effects.

## Key findings

- Kondo effect is enhanced with increased gate voltage
- Gate-tunable anomalous Hall effect observed near Kondo temperature
- Transport properties dominated by intrinsic interactions rather than LaAlO3 thickness

## Abstract

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.