Sputtering growth of Y₃Fe₅O₁₂/Pt bilayers and spin transfer at Y₃Fe₅O₁₂/Pt interfaces

For the majority of previous work on Y₃Fe₅O₁₂ (YIG)/normal metal (NM) bi-layered structures, the YIG layers were grown on Gd₃Ga₅O₁₂ first and were then capped by an NM layer. This work demonstrates the sputtering growth of a Pt/YIG structure where the Pt layer was grown first and the YIG layer was then deposited on the top. The YIG layer shows well-oriented (111) texture, a surface roughness of 0.15 nm, and an effective Gilbert damping constant less than 4.7 × 10^-4, and the YIG/Pt interface allows for efficient spin transfers. This demonstration indicates the feasibility of fabricating high-quality NM/YIG/NM tri-layered structures for new physics studies.