Wideband and on-chip excitation for dynamical spin injection into graphene

Abstract

Graphene is an ideal material for spin transport as very long spin relaxation times and lengths can be achieved even at room temperature. However, electrical spin injection is challenging due to the conductivity mismatch problem. Spin pumping driven by ferromagnetic resonance is a neat way to circumvent this problem as it produces a pure spin current in the absence of a charge current. Here, we show spin pumping into single layer graphene in micron scale devices. A broadband on-chip RF current line is used to bring micron scale permalloy (Ni${}_{80}$Fe${}_{20}$) pads to ferromagnetic resonance with a magnetic field tunable resonance condition. At resonance, a spin current is emitted into graphene, which is detected by the inverse spin hall voltage in a close-by platinum electrode. Clear spin current signals are detected down to a power of a few milliwatts over a frequency range of 2 GHz to 8 GHz. This compact device scheme paves the way for more complex device structures and allows the investigation of novel materials.

arXiv comment7 pages, 4 figures

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Cited by in corpus (8)

• Graphene nanoribbons for quantum electronics
• Chirality as Generalized Spin-Orbit Interaction in Spintronics
• Non-Contact Spin Pumping by Microwave Evanescent Fields
• Quantum Oscillations of Gilbert Damping in Ferromagnetic/Graphene Bilayer Systems
• Spin Seebeck Effect in Graphene
• Dynamical Majorana Ising spin response in a topological superconductor-magnet hybrid by microwave irradiation
• Spin Pumping into two-dimensional systems
• Resonant Edelstein and inverse-Edelstein effects, charge-to-spin conversion, and spin pumping from chiral-spin modes