(a) Out-of-plane spin Seebeck set-up for the YIG/CrO/Pt trilayer device. Temperature gradient, ∇ T , is along the z direction, and an external magnetic field, H , is applied in the y–z plane. θ is the angle between ∇ T and H . (b) θ dependencies of V_SSE at different temperatures for the YIG/CrO/Pt trilayer device for various values of H . (c) External magnetic field H dependence of voltage signal V measured in the YIG/CrO/Pt trilayer device for θ = 20 ° at various temperatures. (d) Temperature dependence of V_SSE for the YIG/CrO/Pt trilayer device for different external magnetic fields H at θ = 20 ° . Solid lines serve as visual guides. (e)  s change ratio Ratio (  s ) @ H due to external magnetic fields H as functions of temperature. Ratio (  s ) @ H = ( V SSE @ H − V SSE @ 0.5 T ) / V SSE @ 0.5 T .  s refers to spin-current transmissivity in the CrO layer. Solid lines serve as visual guides.