The Spin Relaxation Time in a C_(60)-Based Organic Spin Valve at Room Temperature

摘要

We reported the study of the C_(60)-based organic spin valve device, consisting of a trilayer of La_(0.67)Sr_(0.33) MnO_3, an organic C_(60), and coba and we also investigated the electronic properties of the C_(60) thin films using the top-contact C_(60)-FETs. Then the spin relaxation time in C_(60) at room temperature was measured, and it was found to be exceptionally short - just only a few nanoseconds. Our experimental observations strongly suggest that the primary spin relaxation mechanism in the organic material C60 should be the Elliott-Yafet mechanism, in which the spin relaxes whenever a carrier scatters and its velocity changes.