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We investigate the relation between thermal spin-transfer torque (TSTT) andthe spin-dependent Seebeck effect (SDSE), which produces a spin current when atemperature gradient is applied across a metallic ferromagnet, in nanopillarmetallic spin valves. Comparing its angular dependence (aSDSE) with the angledependent magnetoresistance (aMR) measurements on the same device, we are ableto verify that a small spin heat accumulation builds up in our devices. Fromthe SDSE measurement and the observed current driven STT switching current of0.8 mA in our spin valve devices, it was estimated that a temperaturedifference of 230 K is needed to produce an equal amount of TSTT. Experimentsspecifically focused on investigating TSTT show a response that is dominated byoverall heating of the magnetic layer. Comparing it to the current driven STTexperiments we estimate that only ~10% of the response is due to TSTT. Thisleads us to conclude that switching dominated by TSTT requires a directcoupling to a perfect heat sink to minimize the effect of overall heating.Nevertheless the combined effect of heating, STT and TSTT could prove usefulfor inducing magnetization switching when further investigated and optimized.

Comparison between thermal and current driven spin-transfer torque in nanopillar metallic spin valves