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Spin Relaxation In A Germanium Nanowire, S. Patibandla, S. Pramanik, S. Bandyopadhyay, G. C. Tepper
Spin Relaxation In A Germanium Nanowire, S. Patibandla, S. Pramanik, S. Bandyopadhyay, G. C. Tepper
Electrical and Computer Engineering Publications
We report experimental study of spin transport in nanowirespin valve structures consisting of three layers—cobalt, germanium, and nickel. The spin diffusion length in the Ge is estimated to be about 400nm at 1.9K and the corresponding spin relaxation time is about 4ns. At 100K, the spin diffusion length drops to 180nm and the relaxation time is about 0.81ns. These short relaxation times, which depend weakly on temperature, are caused by strong surface roughness scattering that causes rapid spin relaxation via the Elliott-Yafet mode [Elliott, Phys. Rev.96, 266 (1954)].