Abstract
Spin injection and accumulation have been investigated for Ni81Fe19∕Au∕Ni81Fe19 lateral spin valves with various separations between spin injector and detector. The spin valve has been studied by using two distinct measurement configurations: the local and nonlocal measurement configurations. For both configurations, a spin valve signal has been found in the wide temperature range from 15to300K, and the magnitude of the spin valve signal decreases as the temperature increases. Based on the nonlocal spin valve signals, we estimate that the spin-diffusion length of a Au film is 85nm and that the spin-injection efficiency is 73% at T=15K.
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