Temperature difference dependence of coercivity of spin Seebeck voltage for BiY₂Fe₅O₁₂/Pt device made by metal organic decomposition method

The temperature difference ΔT and the thickness dependences of the spin Seebeck voltage (V_SSE) were investigated for the polycrystalline BiY₂Fe₅O₁₂/Pt device made by metal organic decomposition method. As a result of investigation of the ΔT dependence of V_SSE, it was shown that the coercivity of V_SSE largely changed at the certain temperature difference ΔT_g, and ΔT_g was decreased with the thickness of BiY₂Fe₅O₁₂ thin film increases. When ΔT>ΔT_g, the coercivity of V_SSE was almost the same as the coercivity of magnetization curve for the BiY₂Fe₅O₁₂/Pt device. On the other hand, when ΔT<ΔT_g, the coercivity of V_SSE was about twice as the coercivity of V_SSE when ΔT>ΔT_g. Focus attention on the remanence of V_SSE which the gap occurs in the coercivity of V_SSE is almost constant independently of the thickness of BiY₂Fe₅O₁₂ thin films. (author)