Thickness and temperature dependent damping in La$_{0.67}$Sr$_{0.33}$MnO$_{3}$ epitaxial films

TL;DR

This study investigates how thickness and temperature influence magnetic damping in La0.67Sr0.33MnO3 epitaxial films, revealing complex behavior due to competing scattering mechanisms and electron structure effects.

Contribution

It provides new insights into the thickness and temperature dependence of damping in complex transition-metal oxide films, highlighting the role of electron structure and lattice distortions.

Findings

Damping behavior varies with film thickness and temperature.

Two distinct scattering mechanisms influence damping.

Electron structure and oxygen octahedra distortions are key factors.

Abstract

The damping of La0.67Sr0.33MnO3 (LSMO) epitaxial films as a function of thickness at different temperatures was studied. The competition between two scattering types (\r{ho}-like and {\sigma}-like) with entirely distinct thickness and temperature dependencies resulted in complicated damping behavior. The behavior of {\sigma}-like damping in LSMO films is consistent with the behavior in magnetic metal films. However, because \r{ho}-like damping is sensitive to the fine electron structure near the Fermi surface, the distortion of the oxygen octahedra controlled by the film thickness is an important factor in controlling the damping. Our study demonstrates that the complexity of damping in LSMO epitaxial films is a consequence of strong-correlation effects, which are characteristic of complex transition-metal oxides.