Spin-lattice relaxation phenomena in manganite La0.7Sr0.3MnO3 thin films
M. C. Weber, B. Hillebrands, V. Moshnyaga, and K. Samwer
TL;DR
This study investigates spin-lattice relaxation in La0.7Sr0.3MnO3 thin films using time-resolved magneto-optics, revealing two relaxation regimes and the influence of heat diffusion on ferromagnetic recovery.
Contribution
It provides new insights into the spin-lattice relaxation times and heat diffusion properties in manganite thin films, highlighting the role of weak spin-orbit coupling.
Findings
Two distinct spin-lattice relaxation regimes identified.
Relaxation time is independent of pump pulse energy.
Heat diffusion limits the ferromagnetic recovery speed.
Abstract
Time-resolved magneto-optics was used to study spin-lattice relaxation dynamics in thin epitaxial La0.7Sr0.3MnO3 films. Two distinct recovery regimes of the ferromagnetic order can be resolved upon photoexcitation, which manifest themselves by two different relaxation times. A pump pulse energy independent spin-lattice relaxation time can be deduced. Due to a weak spin-orbit coupling in manganites this spin-lattice relaxation time is much longer than in ferromagnetic metals. Heat flow into the substrate sets the ultimate recovery speed of the ferromagnetic order and allows for a determination of heat diffusion properties of manganite films.
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