Temperature dependence of the Gilbert damping of La0.7Sr0.3MnO3 thin films

Due to its half metallic nature, La0.7Sr0.3MnO3 is an attractive highly correlated electronic system to obtain ultralow magnetic damping. In this paper we analyze the temperature and thickness dependence of the damping of the magnetization dynamic of epitaxial thin La0.7Sr0.3MnO3 films. Our analysis reveals that the damping encompasses resistivelike and conductivelike contributions, as in transition metal ferromagnets. The data also show a large increase of the ferromagnetic resonance linewidth at low temperature, a feature that we ascribe to the presence of a dead layer, insulating and magnetically active, that behaves like a spin sink. The associated spin-pumping term shows a strong temperature dependence, linked to that of the spin mixing conductance. By clarifying some unexplored aspects of spin dynamics in half-metallic manganites, our results contribute to the progress in the burgeoning field of oxide spin orbitronics.

Automated summary

This paper analyzes the temperature and thickness dependence of damping in epitaxial thin La0.7Sr0.3MnO3 films, and reveals that the damping involves resistive and conductive contributions, along with the presence of a dead layer affecting the linewidth of ferromagnetic resonance spectra.