Abbreviated Journal Title
Appl. Phys. Lett.
Keywords
ROOM-TEMPERATURE; SEMICONDUCTORS; TRANSPORT; SILICON; VALVE; Physics, Applied
Abstract
We present a study of dynamical spin injection from a three-dimensional ferromagnet into two-dimensional single-layer graphene. Comparative ferromagnetic resonance (FMR) studies of ferromagnet/graphene strips buried underneath the central line of a coplanar waveguide show that the FMR linewidth broadening is the largest when the graphene layer protrudes laterally away from the ferromagnetic strip, indicating that the spin current is injected into the graphene areas away from the area directly underneath the ferromagnet being excited. Our results confirm that the observed damping is indeed a signature of dynamical spin injection, wherein a pure spin current is pumped into the single-layer graphene from the precessing magnetization of the ferromagnet. The observed spin pumping efficiency is difficult to reconcile with the expected backflow of spins according to the standard spin pumping theory and the characteristics of graphene, and constitutes an enigma for spin pumping in two-dimensional structures.
Journal Title
Applied Physics Letters
Volume
106
Issue/Number
3
Publication Date
1-1-2015
Document Type
Article
DOI Link
Language
English
First Page
5
WOS Identifier
ISSN
0003-6951
Recommended Citation
Singh, S.; Ahmadi, A.; Cherian, C. T.; Mucciolo, E. R.; del Barco, E.; and Özyilmaz, B., "Dynamical spin injection at a quasi-one-dimensional ferromagnet-graphene interface" (2015). Faculty Bibliography 2010s. 6802.
https://stars.library.ucf.edu/facultybib2010/6802
Comments
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