Abstract
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 0 K is approached. By quantitatively analyzing the different contributions, we isolate the temperature dependence of the spin-mixing conductance and observe features that are correlated with the bands of magnon spectrum in YIG.
Highlights
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 0 K is approached
A temperature gradient across the magnetic insulator thickness leads to the diffusion of thermal magnons that accumulate at the interface with the heavy metal (HM).[16,17]
Low frequency magnons play a dominant role due to their large population and longer thermalization lengths. Their contribution can be suppressed by large magnetic fields, which raise the energies of the magnon spectrum.[14,15]
Summary
Cite as: Appl. Phys. Lett. 119, 032401 (2021); https://doi.org/10.1063/5.0050205 Submitted: 12 March 2021 • Accepted: 02 July 2021 • Published Online: 19 July 2021 ARTICLES YOU MAY BE INTERESTED IN Time-resolved measurement of magnetization vectors driven by pulsed spin–orbit torque Applied Physics Letters 119, 022404 (2021); https://doi.org/10.1063/5.0055458 Strong magnon–photon coupling with chip-integrated YIG in the zero-temperature limit Applied Physics Letters 119, 033502 (2021); https://doi.org/10.1063/5.0054837 Current-induced magnetization switching at charge-transferred interface between topological insulator (Bi,Sb)2Te3 and van der Waals ferromagnet Fe3GeTe2 Applied Physics Letters 119, 032402 (2021); https://doi.org/10.1063/5.0057863
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