Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2008-09-23
Phys. Rev. B 78, 064423 (2008)
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
9 pages, 11 figures
Scientific paper
10.1103/PhysRevB.78.064423
We describe electrical detection of spin pumping in metallic nanostructures. In the spin pumping effect, a precessing ferromagnet attached to a normal-metal acts as a pump of spin-polarized current, giving rise to a spin accumulation. The resulting spin accumulation induces a backflow of spin current into the ferromagnet and generates a dc voltage due to the spin dependent conductivities of the ferromagnet. The magnitude of such voltage is proportional to the spin-relaxation properties of the normal-metal. By using platinum as a contact material we observe, in agreement with theory, that the voltage is significantly reduced as compared to the case when aluminum was used. Furtheremore, the effects of rectification between the circulating rf currents and the magnetization precession of the ferromagnet are examined. Most significantly, we show that using an improved layout device geometry these effects can be minimized.
Costache Marius V.
der Wal Caspar H. van
van Wees Bart Jan
Watts S. M.
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