1 research outputs found
Spin Seebeck effect in polycrystalline yttrium iron garnet pellets prepared by the solid-state method [Letter]
We study the properties of polycrystalline bulk yttrium iron garnet (YIG) pellets
prepared by the solid-state method, where the choice of the sintering temperature can lead to
mixed phases of yttrium iron perovskite (YIP) and YIG or single phase YIG. Magnetometry
shows multiple switching regimes in the mixed-phase pellets where the saturation magnetization
is dominated by the proportion of YIG present. Ferromagnetic resonance was used to corroborate
the saturation magnetization from magnetometry and to extract the spin wave damping α. The
lowest damping was observed for the YIG pellet, which resulted in a spin Seebeck effect (SSE)
coefficient that was approximately 55% of single crystal YIG. This demonstrates that macroscale
crystallization does not play a major role in the SSE and paves the way for utilising polycrystalline
samples for thermomagnetic applications