Antisymmetric Planar Hall Effect in Rutile Oxide Films Induced by the Lorentz Force

TL;DR

This study reports the first experimental observation of the antisymmetric planar Hall effect in rutile oxide films, showing it is induced by the Lorentz force and independent of current direction or temperature.

Contribution

It provides the first experimental evidence of APHE in centrosymmetric rutile films and links it to the Lorentz force, expanding understanding of Hall effects beyond Weyl semimetals.

Findings

APHE observed in rutile RuO2 and IrO2 films

Hall resistivity linearly proportional to in-plane magnetic field component

APHE is independent of current direction and temperature

Abstract

The conventional Hall effect is linearly proportional to the field component or magnetization component perpendicular to a film. Despite the increasing theoretical proposals on the Hall effect to the in-plane field or magnetization in various special systems induced by the Berry curvature, such an unconventional Hall effect has only been experimentally reported in Weyl semimetals and in a heterodimensional superlattice. Here, we report an unambiguous experimental observation of the antisymmetric planar Hall effect (APHE) with respect to the in-plane magnetic field in centrosymmetric rutile RuO2 and IrO2 single-crystal films. The measured Hall resistivity is found to be linearly proportional to the component of the applied in-plane magnetic field along a particular crystal axis and to be independent of the current direction or temperature. Both the experimental observations and theoretical calculations confirm that the APHE in rutile oxide films is induced by the Lorentz force. Our findings can be generalized to ferromagnetic materials for the discovery of anomalous Hall effects and quantum anomalous Hall effects induced by in-plane magnetization. In addition to significantly expanding knowledge of the Hall effect, this work opens the door to explore new members in the Hall effect family.