Longitudinal and transverse magnetoresistance in films with tilted out-of-plane magnetic anisotropy

TL;DR

This paper demonstrates that tilted out-of-plane magnetic anisotropy causes unique magnetotransport phenomena, including the extraordinary Hall effect and non-monotonic anisotropic magnetoresistance, which are observed across multiple ferromagnetic systems and explained by a theoretical model.

Contribution

The study introduces a theoretical model explaining the emergence of unusual magnetotransport effects due to tilted anisotropy, supported by experimental evidence across various ferromagnetic materials.

Findings

Extraordinary Hall effect observed with in-plane magnetic field.

Non-monotonic anisotropic magnetoresistance with normal field.

Effects are universal across different ferromagnetic systems.

Abstract

Tilted off-plane magnetic anisotropy induces two unusual characteristic magnetotransport phenomena: extraordinary Hall effect in the presence of an in-plane magnetic field, and non-monotonic anisotropic magnetoresistance in the presence of a field normal to the sample plane. We show experimentally that these effects are generic, appearing in multiple ferromagnetic systems with tilted anisotropy introduced either by oblique deposition from a single source or in binary systems co-deposited from separate sources. We present a theoretical model demonstrating that these observations are natural results of the standard extraordinary Hall effect and anisotropic magnetoresistance, when the titled anisotropy is properly accounted for. Such a scenario may help explaining various previous intriguing measurements by other groups.