Antisymmetric magnetoresistance of the SrTiO3/LaAlO3 interface

TL;DR

This paper reports on the antisymmetric magnetoresistance observed at the SrTiO3/LaAlO3 interface, attributed to a non-homogeneous Hall effect caused by non-uniform magnetization, with implications for understanding interface magnetism.

Contribution

It identifies the origin of antisymmetric magnetoresistance as a non-homogeneous Hall effect linked to field-induced magnetization at oxide interfaces.

Findings

Antisymmetric resistance increases with decreasing temperature and increasing magnetic field.

The phenomenon is explained by a non-uniform Hall effect involving extraordinary Hall contributions.

Presence of non-uniform, field-induced magnetization at the interface.

Abstract

The longitudinal resistance $R_{xx}$ of the SrTiO3/LaAlO3 interface with magnetic fields applied perpendicular to the interface has an antisymmetric term (namely, $R_{xx}(H)\neq R_{xx}(-H)$) which increases with decreasing temperature and increasing field. We argue that the origin of this phenomenon is a non-homogeneous Hall effect with clear contribution of an extraordinary Hall effect, suggesting the presence of non-uniform field-induced magnetization.