Polarization amplification by spin-doping in nanomagnetic/graphene hybrid systems

Autor:	Anlauf, Tim, Prada, Marta, Freercks, Stefan, Bosnjak, Bojan, Frömter, Robert, Sichau, Jonas, Oepen, Hans Peter, Tiemann, Lars, Blick, Robert H.
Rok vydání:	2020
Předmět:	Condensed Matter - Mesoscale and Nanoscale Physics Condensed Matter - Materials Science
Zdroj:	Phys. Rev. Materials 5, 034006 (2021)
Druh dokumentu:	Working Paper
DOI:	10.1103/PhysRevMaterials.5.034006
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. Comment: Title of original submission "A nanomagnetic polarization amplifier for graphene" was changed
Databáze:	arXiv
Externí odkaz:	http://arxiv.org/abs/2008.08813 Zobrazit plný text záznamu View this record from Arxiv