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Report No.

Magnetic field dependence of the nonlocal spin Seebeck effect in Pt/YIG/Pt systems at low temperatures

Oyanagi, Koichi*; Kikkawa, Takashi*; Saito, Eiji

We report the nonlocal spin Seebeck effect (nlSSE) in a lateral configuration of Pt/Y$$_3$$Fe$$_5$$O$$_{12}$$(YIG)/Pt systems as a function of the magnetic field $$B$$ (up to 10 T) at various temperatures $$T$$ (3 K $$< T <$$ 300 K). The nlSSE voltage decreases with increasing B in a linear regime with respect to the input power (the applied charge-current squared $$I^2$$). The reduction of the nlSSE becomes substantial when the Zeeman energy exceeds thermal energy at low temperatures, which can be interpreted as freeze-out of magnons relevant for the nlSSE. Furthermore, we found the nonlinear power dependence of the nlSSE with increasing $$I$$ at low temperatures ($$T <$$ 20 K), at which the B-induced signal reduction became less visible. Our experimental results suggest that in the nonlinear regime, high-energy magnons are overpopulated compared to those expected from the thermal energy. We also estimate the magnon spin diffusion length as functions of $$B$$ and $$T$$.



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Category:Nanoscience & Nanotechnology



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