Magnetoresistance and magnetic anisotropy in La$_{0.5}$Sr$_{0.5}$CoO$_{3-\delta}$ film

TL;DR

This study investigates the magnetic and transport properties of La$_{0.5}$Sr$_{0.5}$CoO$_{3-elta}$ films, revealing how magnetic anisotropy and inhomogeneity influence magnetoresistance and induce a temperature-driven spin reorientation transition.

Contribution

It provides new insights into how shape and strain-induced anisotropies affect magnetoresistance and magnetic ordering in La$_{0.5}$Sr$_{0.5}$CoO$_{3-elta}$ films.

Findings

Magnetoresistance anisotropy is governed by shape and strain-induced anisotropies.

A temperature-driven spin reorientation transition occurs from out-of-plane to in-plane order.

Magnetic properties are significantly affected by film inhomogeneity and substrate interaction.

Abstract

The magnetic and transport properties of La$_{0.5}$Sr$_{0.5}$CoO$_{3-\delta}$ film grown on a LaAlO$_3$ substrate by pulsed-laser deposition are studied. The properties are found to be influenced by a combined influence of the magnetic anisotropy and inhomogeneity. Magnetoresistance anisotropy is determined by the shape anisotropy and the strain-induced magnetic anisotropy due to the film-substrate lattice interaction. Indications of the temperature-driven spin reorientation transition from an out-of plane orderded state at low temperatures to an in-plane ordered state at high temperatures as a result of competition between the mentioned anisotropy sources are found.