We compare thermal-gradient-driven transverse voltages in ferrimagnetic-insulator/heavy-metal bilayers (${\mathrm{Tm}}_3{\mathrm{Fe}}_5{\mathrm{O}}_{12}/\mathrm{W}$ and ${\mathrm{Tm}}_3{\mathrm{Fe}}_5{\mathrm{O}}_{12}/\mathrm{Pt}$) to corresponding electrically driven transverse resistances at and above room temperature. We find for ${\mathrm{Tm}}_3{\mathrm{Fe}}_5{\mathrm{O}}_{12}/\mathrm{W}$ that the thermal and electrical effects can be explained by a common spin-current detection mechanism, the physics underlying spin Hall magnetoresistance (SMR). However, for ${\mathrm{Tm}}_3{\mathrm{Fe}}_5{\mathrm{O}}_{12}/\mathrm{Pt}$ the ratio of the electrically driven transverse voltages (planar Hall signal/anomalous Hall signal) is much larger than the ratio of corresponding thermal-gradient signals, a result which is very different from expectations for a SMR-based mechanism alone. We ascribe this difference to a proximity-induced magnetic layer at the ${\mathrm{Tm}}_3{\mathrm{Fe}}_5{\mathrm{O}}_{12}/\mathrm{Pt}$ interface.

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• Spin caloritronics
• Spin current
• Spin torque
• Spin-orbit coupling
• Spintronics