Electrical spin injection and detection in Germanium using three terminal geometry

Details Electrical spin injection and detection in Germanium using three terminal geometry Electrical spin injection and detection in Germanium using three terminal geometry

2011-07-18

arxiv.org/abs/1107.3510v1

Physics

Condensed Matter

Materials Science

4 pages, 3 figures

Scientific paper

In this letter, we report on successful electrical spin injection and detection in \textit{n}-type germanium-on-insulator (GOI) using a Co/Py/Al$_{2}$O$_{3}$ spin injector and 3-terminal non-local measurements. We observe an enhanced spin accumulation signal of the order of 1 meV consistent with the sequential tunneling process via interface states in the vicinity of the Al$_{2}$O$_{3}$/Ge interface. This spin signal is further observable up to 220 K. Moreover, the presence of a strong \textit{inverted} Hanle effect points at the influence of random fields arising from interface roughness on the injected spins.

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