Spin diffusion length of Permalloy using spin absorption in lateral spin valves

Edurne Sagasta, Yasutomo Omori, Miren Isasa, YoshiChika Otani, Luis E. Hueso, Fèlix Casanova

Published 2019-04-03Version 1

We employ the spin absorption technique in lateral spin valves to extract the spin diffusion length of Permalloy (Py) as a function of temperature and resistivity. A linear dependence of the spin diffusion length with conductivity of Py is observed, evidencing that Elliott-Yafet is the dominant spin relaxation mechanism in Permalloy. Completing the data set with additional data found in literature, we obtain $\lambda_{Py}= (0.91\pm 0.04) (f\Omega m^2)/\rho_{Py}$.