Dynamic Spin Injection into Chemical Vapor Deposited Graphene

TL;DR

This paper demonstrates that spin pumping can dynamically inject spins into CVD-grown graphene, revealing a significant enhancement of spin-orbit coupling at the interface, which is promising for spintronic applications.

Contribution

It provides experimental evidence of dynamic spin injection into CVD graphene and highlights the strong interface-induced spin-orbit coupling enhancement.

Findings

Enhanced Gilbert damping at Py/graphene interface

Spin pumping driven by magnetization dynamics

Strong spin-orbit coupling in CVD graphene

Abstract

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, exceeding that observed in even 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.