Polarization amplification by spin-doping in nanomagnetic/graphene hybrid systems
Abstract
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.
Keywords
Cite
@article{arxiv.2008.08813,
title = {Polarization amplification by spin-doping in nanomagnetic/graphene hybrid systems},
author = {Tim Anlauf and Marta Prada and Stefan Freercks and Bojan Bosnjak and Robert Frömter and Jonas Sichau and Hans Peter Oepen and Lars Tiemann and Robert H. Blick},
journal= {arXiv preprint arXiv:2008.08813},
year = {2021}
}
Comments
Title of original submission "A nanomagnetic polarization amplifier for graphene" was changed