中国科学技术大学 Peng Li--Home-- P. Li, D. Ellsworth, H. Chang, P. Janantha, D. Richardson, et al. Generation of Pure Spin Currents via Light-Induced Spin Seebeck Effect in Self-Biased Hexagonal Ferrite Films

P. Li, D. Ellsworth, H. Chang, P. Janantha, D. Richardson, et al. Generation of Pure Spin Currents via Light-Induced Spin Seebeck Effect in Self-Biased Hexagonal Ferrite Films

Release time:2022-07-11

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Abstract:: Light-induced generation of pure spin currents in a Pt(2.5 nm)/BaFe12O19(1.2 μm)/sapphire(0.5 mm) structure is reported. The BaFe12O19 film had strong in-plane uniaxial anisotropy and was therefore self-biased. Upon exposure to light, a temperature difference (ΔT) was established across the BaFe12O19 thickness that gave rise to a pure spin current in the Pt via the spin Seebeck effect. Via the inverse spin Hall effect, the spin current produced an electric voltage across one of the Pt lateral dimensions. The voltage varied with time in the same manner as ΔT and flipped its sign when the magnetization in BaFe12O19 was reversed. This work was supported in part by the U.S. Army Research Office under Award # W911NF-14-1-0501; the U.S. National Science Foundation under Award # ECCS-1231598; C-SPIN, which is one of the SRC STARnet Centers sponsored by MARCO and DARPA; and SHINES, which is an Energy Frontier Research Center funded by the U.S. Department of Energy, Office of Science, Basic Energy Sciences under Award # SC0012670. Mr. Himadri Dey, Professor Gyorgy Csaba, and Professor Wolfgang Porod are gratefully acknowledged for helping cut substrates.