Suppression of spin-pumping by a MgO tunnel-barrier

Details Suppression of spin-pumping by a MgO tunnel-barrier Suppression of spin-pumping by a MgO tunnel-barrier

2009-11-16

arxiv.org/abs/0911.3182v1

Appl. Phys. Lett. 96, 022502, 2010

Physics

Condensed Matter

Materials Science

Scientific paper

Spin-pumping generates pure spin currents in normal metals at the ferromagnet (F)/normal metal (N) interface. The efficiency of spin-pumping is given by the spin mixing conductance, which depends on N and the F/N interface. We directly study the spin-pumping through an MgO tunnel-barrier using the inverse spin Hall effect, which couples spin and charge currents and provides a direct electrical detection of spin currents in the normal metal. We find that spin-pumping is suppressed by the tunnel-barrier, which is contrary to recent studies that suggest that the spin mixing conductance can be enhanced by a tunnel-barrier inserted at the interface.

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