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The longitudinal spin Seebeck effect (LSSE) is investigated in various garnet ferrites Y_3-xRₓFe_5-yMyO₁₂ (R=Gd, Ca; M=Al, Mn, V, In, Zr) by means of the inverse spin Hall effect in Pt films. The magnitude of the LSSE voltage in the Pt/Y_3-xRₓFe_5-yMyO₁₂ samples is found to be enhanced with increasing concentration of Fe in the garnet ferrites, which can be explained by a change in the spin-mixing conductance at the Pt/Y_3-xRₓFe_5-yMyO₁₂ interfaces. We also investigate the dependence of the LSSE voltage on macroscopic magnetic parameters of Y_3-xRₓFe_5-yMyO₁₂. The experimental results show that the LSSE voltage in the Pt/Y_3-xRₓFe_5-yMyO₁₂ samples has a positive correlation with the Curie temperature and the saturation magnetization, but no clear correlation with the gyromagnetic ratio and the Gilbert damping constant of the samples.
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Uchida et al. (2013) studied this question.
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