Wideband and On-Chip Excitation for Dynamical Spin Injection into Graphene

Indolese, David and Makk, Péter and Thodkar, Kishan and Schönenberger, Christian and Jünger, Christian and Zihlmann, Simon. (2018) Wideband and On-Chip Excitation for Dynamical Spin Injection into Graphene. Physical review applied, 10 (4).

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Official URL: https://edoc.unibas.ch/68877/

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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 radio-frequency (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 2-8 GHz. This compact device scheme paves the way for more complex device structures and allows the investigation of novel materials.
Faculties and Departments:05 Faculty of Science > Departement Physik > Physik > Experimentalphysik Nanoelektronik (Schönenberger)
UniBasel Contributors:Schönenberger, Christian and Indolese, David and Zihlmann, Simon and Makk, Peter and Jünger, Christian and Thodkar, Kishan
Item Type:Article, refereed
Article Subtype:Research Article
Publisher:American Physical Society
Note:Publication type according to Uni Basel Research Database: Journal article
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Last Modified:04 Apr 2019 16:23
Deposited On:04 Apr 2019 16:23

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