Frequency dependence of the longitudinal spin Seebeck effect

Yong Xu, Weisheng Zhao, Stéphane Mangin
2018 Physical review B  
The spin Seebeck effect provides an easy way to create and manipulate spin current. Schreier et al. experimentally observed a decrease of spin Seebeck voltage at high frequencies in the yttrium iron garnet/Pt system [Phys. Rev. B 93, 224430 (2016)]. The frequency dependence was attributed to the magnon spectrum. Here we provide a different explanation using the frequency dependence of the ac spin current. By combining a phenomenological two-temperature model with the ac-temperature method, our
more » ... rature method, our calculation shows that the frequency dependence of the spin current is determined by the thermal wavelength and the thermal boundary conditions of the phonons and the magnons.
doi:10.1103/physrevb.98.144408 fatcat:rfm4uayxhjg5lofzjifrq3muua