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Proceedings Paper

Spin pumping at Permalloy/graphene interface
Author(s): S. Singh; D. Markó; E. del Barco; B. Özyilmaz
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Paper Abstract

Ferromagnetic resonance (FMR) measurements on Permalloy/graphene (Py/Gr) films show an enhancement of the Gilbert damping in the ferromagnetic layer as a consequence of spin pumping at the Py/Gr interface, which is driven by the Py magnetization dynamics. The remarkable increase in the FMR line-width compares with observations in other bilayer systems in which thick layers (thicker than the spin diffusion length) of heavy metals with strong spin-orbit interaction are employed as the non-magnetic layer. By reversing the stacking order of the graphene/ferromagnet, we rule out any interface effects and calculate the damping of the ferromagnet due to the graphene. Our results indicate that spin relaxation in CVD graphene must be greatly enhanced in order to account for the losses of angular momentum in the ferromagnet.

Paper Details

Date Published: 26 September 2013
PDF: 8 pages
Proc. SPIE 8813, Spintronics VI, 88132O (26 September 2013); doi: 10.1117/12.2025829
Show Author Affiliations
S. Singh, Univ. of Central Florida (United States)
D. Markó, National Univ. of Singapore (Singapore)
E. del Barco, Univ. of Central Florida (United States)
B. Özyilmaz, National Univ. of Singapore (Singapore)

Published in SPIE Proceedings Vol. 8813:
Spintronics VI
Henri-Jean Drouhin; Jean-Eric Wegrowe; Manijeh Razeghi, Editor(s)

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