Polarization amplification by spin-doping in nanomagnetic/graphene hybrid systems
| Autor: | Jonas Sichau, Bojan Bosnjak, Lars Tiemann, Stefan Freercks, Tim Anlauf, Marta Prada, Robert H. Blick, Hans Peter Oepen, Robert Frömter |
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| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
Materials science
Physics and Astronomy (miscellaneous) FOS: Physical sciences 02 engineering and technology 01 natural sciences law.invention Condensed Matter::Materials Science law Mesoscale and Nanoscale Physics (cond-mat.mes-hall) 0103 physical sciences General Materials Science 010306 general physics Polarization (electrochemistry) Spin (physics) Electron paramagnetic resonance Condensed Matter - Materials Science Condensed matter physics Spin polarization Condensed Matter - Mesoscale and Nanoscale Physics Graphene Materials Science (cond-mat.mtrl-sci) Resonance 021001 nanoscience & nanotechnology Spin diffusion Condensed Matter::Strongly Correlated Electrons Nanodot 0210 nano-technology |
| Popis: | The generation of non-equilibrium electron spin polarization, spin transport, and spin detection are fundamental in many quantum devices. We demonstrate that a lattice of magnetic nanodots enhances the electron spin polarization in monolayer graphene via carrier exchange. We probed the spin polarization through a resistively-detected variant of electron spin resonance (ESR) and observed resonance amplification mediated by the presence of the nanodots. Each nanodot locally injects a surplus of spin-polarized carriers into the graphene, and the ensemble of all "spin hot spots" generates a non-equilibrium electron spin polarization in the graphene layer at macroscopic lengths. This occurs whenever the interdot distance is comparable or smaller than the spin diffusion length. Title of original submission "A nanomagnetic polarization amplifier for graphene" was changed |
| Databáze: | OpenAIRE |
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