In LAFO films the spin diffusion length of electrically generated low-k magnons stays nearly constant with temperature while that of thermally generated high-k magnons decreases, indicating magnon-phonon scattering for the latter and impurity relaxational scattering for the former.
J¨ ackle, On the ultrasonic attenuation in glasses at low temperatures, Zeitschrift f¨ ur Physik257, 212 (1972)
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Understanding Damping Mechanisms via Spin Diffusion Length in Low-damping Li$_{0.5}$Al$_{1.0}$Fe$_{1.5}$O$_4$ Spinel Ferrite Thin Films
In LAFO films the spin diffusion length of electrically generated low-k magnons stays nearly constant with temperature while that of thermally generated high-k magnons decreases, indicating magnon-phonon scattering for the latter and impurity relaxational scattering for the former.