We performed temperature-dependent optical pump - THz emission measurements in Y3Fe5O12 (YIG)|Pt from 5 K to room temperature in the presence of an externally applied magnetic field. We study the temperature dependence of the spin Seebeck effect and observe a continuous increase as temperature is decreased, opposite to what is observed in electrical measurements where the spin Seebeck effect is suppressed as 0K is approached. By quantitatively analysing the different contributions we isolate the temperature dependence of the spin-mixing conductance and observe features that are correlated to the bands of magnon spectrum in YIG.
@article{arxiv.2103.07307,
title = {Temperature dependence of the interface spin Seebeck effect},
author = {F. N. Kholid and D. Hamara and M. Terschanski and F. Mertens and D. Bossini and M. Cinchetti and L. McKenzie-Sell and J. Patchett and D. Petit and R. Cowburn and J. Robinson and J. Barker and C. Ciccarelli},
journal= {arXiv preprint arXiv:2103.07307},
year = {2021}
}