Depositing magnetic insulators on graphene has been a promising route to introduce magnetism via exchange proximity interaction in graphene for future spintronics applications. Molecule-based magnets may offer unique opportunities because of their synthesis versatility. Here, we investigated the magnetic proximity effect of epitaxial iron phthalocyanine (FePc) molecules on high-quality monolayer and bilayer graphene devices on hexagonal boron nitride substrate by probing the local and non-local transport. Although the FePc molecules introduce large hole doping effects combined with mobility degradation, the magnetic proximity gives rise to a canted antiferromagnetic state under a magnetic field in the monolayer graphene. On bilayer graphene and FePc heterostructure devices, the non-local transport reveals a pronounced Zeeman spin-Hall effect. Further analysis of the scattering mechanism in the bilayer shows a dominated long-range scattering. Our findings in graphene/organic magnetic insulator heterostructure provide a new insight for the use of molecule-based magnets in two-dimensional spintronic devices.
@article{arxiv.2103.12974,
title = {Proximity Effect of Epitaxial Iron Phthalocyanine Molecules on High-Quality Graphene Devices},
author = {Haiyang Pan and Xiaobo Wang and Qiaoming Wang and Xiaohua Wu and Chang Liu and Nian Lin and Yue Zhao},
journal= {arXiv preprint arXiv:2103.12974},
year = {2021}
}