Lock-in thermography measurements of the spin Peltier effect in a compensated ferrimagnet and its comparison to the spin Seebeck effect A Yagmur, R Iguchi, S Geprägs et al. -Relationship between anomalous Ettingshausen effect and anomalous Nernst effect in an FePt thin film T Seki, R Iguchi, K Takanashi et al. -Enhanced thermo-spin effects in ironoxide/metal multilayers R Ramos, I Lucas, P A Algarabel et al. -This content was downloaded from IP address 207.241.231.82 on 26/04 The spin Peltier

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... fect (SPE) induced by the spin Hall effect has been investigated in Pt/yttrium-iron-garnet (YIG) junctions by the lock-in thermography technique. First, we propose and demonstrate a new method enabling systematic measurements of the charge-current angle dependence of spin-caloritronic and thermoelectric phenomena, confirming the symmetry of the SPE. Then, to investigate the temporal response of the SPE, we measured the charge-current frequency dependence of the spin-current-induced temperature modulation in a wide frequency range. The SPE signals are found to be almost independent of the frequency up to 100 Hz although the Joule-heating signals in the Pt layer are strongly dependent on the frequency, indicating that the spin-current-induced temperature modulation reaches the steady state in a much shorter time than the conventional heating effects. The experimental methods and results reported here will be useful for clarifying mechanisms and behaviors of spin-caloritronic and thermoelectric phenomena.