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Spin pumping enables the vertical transport of pure spin current through Alin a Pd/Al/Ni80Fe20(Py) trilayer film, in which the Py acts as a spin battery.The spin current injected into the Al flows through the Al to reach the Pd,resulting in the generation of electromotive forces due to the inverse spinHall effect in the Pd. The electromotive forces decreased with increasingthickness of the Al layer. A simple model based on the theory by Tserkovnyak etal., [Phys. Rev. B, 66, 224403 (2002)] allows an estimation of the spincoherence of the perpendicular spin transport in the Al of 61 nm. Thiscomparatively short coherence is attributed to a reduction in spin pumpingefficiency because of the roughness of the Al/Py interface.

Vertical Spin Transport in Al with Pd/Al/Ni80Fe20 Trilayer Films at Room Temperature by Spin Pumping