Non-local magnon transport in Pt/Li_0.5Al_1.0Fe_1.5O₄ systems

Spin wave-based electronics rely on the existence of low damping magnetic insulators for coherent excitation and propagation of spin waves. Toward this end, it is important to study non-local magnon transport in such systems to gauge their promise as media for spin wave transport. Previously, we demonstrated the synthesis of the novel spinel oxide magnetic insulator Li_0.5Al_1.0Fe_1.5O₄ (LAFO) films on (001) oriented MgGa₂O₄ (MGO) and MgAl₂O₄ (MAO) substrates that possess a Gilbert damping parameter on the order of 10^-3. In this talk, we present our results on non-local magnon transport in LAFO/MGO and LAFO/MAO systems, in which LAFO exhibits strain-induced perpendicular magnetic anisotropy and easy-plane magnetic anisotropy respectively. By studying the non-local voltage amplitude generated via the inverse spin Hall effect as a function of the separation of two overlaying Pt electrodes, we extract a spin diffusion length in LAFO of 1.8 um. This large spin diffusion length corroborates the low damping in LAFO and shows the promise of LAFO as a candidate material for future spintronics applications.