We demonstrate dynamic spin injection into chemical vapor deposition (CVD) grown graphene by spin pumping from permalloy (Py) layers. Ferromagnetic resonance measurements at room temperature reveal a strong enhancement of the Gilbert damping at the Py/graphene interface, indeed exceeding that observed in Py/platinum interfaces. Similar results are also shown on Co/graphene layers. This enhancement in the Gilbert damping is understood as the consequence of spin pumping at the interface driven by magnetization dynamics. Our observations suggest a strong enhancement of spin-orbit coupling in CVD graphene, in agreement with earlier spin valve measurements.
Bibliographical noteFunding Information:
A.K.P. and B.O. acknowledge support from the Singapore National Research Foundation Grant Nos. NRF-RF2008-07 and NUS-YIA (R144-000-283-101), and S.S., B.B. and E.d.B. from NSF (Grant No. DMR-0747587).
All Science Journal Classification (ASJC) codes
- Physics and Astronomy (miscellaneous)