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Article Dans Une Revue Physical Review B: Condensed Matter and Materials Physics (1998-2015) Année : 2017

Imaging spin diffusion in germanium at room temperature

Résumé

We report on the nonlocal detection of optically oriented spins in lightly n-doped germanium at room temperature. Localized spin generation is achieved by scanning a circularly polarized laser beam (λ = 1550 nm) on an array of lithographically defined Pt microstructures. The in-plane oriented spin generated at the edges of such microstructures, placed at different distances from a spin-detection element, allows for a direct imaging of spin diffusion in the semiconductor, leading to a measured spin diffusion length of about 10 μm. Two different spin-detection blocks are employed, consisting of either a magnetic tunnel junction or a platinum stripe where the spin current is converted in an electrical signal by the inverse spin-Hall effect. The second solution represents the realization of a nonlocal spin-injection/detection scheme that is completely free from ferromagnetic functional blocks.

Dates et versions

cea-01963806 , version 1 (21-12-2018)

Identifiants

Citer

C. Zucchetti, F. Bottegoni, C. Vergnaud, F. Ciccacci, G. Isella, et al.. Imaging spin diffusion in germanium at room temperature. Physical Review B: Condensed Matter and Materials Physics (1998-2015), 2017, 96 (1), pp.014403. ⟨10.1103/physrevb.96.014403⟩. ⟨cea-01963806⟩
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