Measurement of the Induced Magnetic Polarisation of Rotated-Domain Graphene Grown on Co Film with Polarised Neutron Reflectivity.
Razan Omar M AboljadayelChristy John KinaneCarlos Antonio Fernandes VazDavid Michael LoveMarie-Blandine MartinAndrea Cabrero-VilatelaPhilipp Braeuninger-WeimerAdrian IonescuAndrew John CaruanaTimothy Randall CharltonJustin LlandroPedro Manuel da Silva MonteiroCrispin Henry William BarnesStephan HofmannSean LangridgePublished in: Nanomaterials (Basel, Switzerland) (2023)
In this paper, we determine the magnetic moment induced in graphene when grown on a cobalt film using polarised neutron reflectivity (PNR). A magnetic signal in the graphene was detected by X-ray magnetic circular dichroism (XMCD) spectra at the C K -edge. From the XMCD sum rules an estimated magnetic moment of 0.3 μ B /C atom, while a more accurate estimation of 0.49 μ B /C atom was obtained by carrying out a PNR measurement at 300 K. The results indicate that the higher magnetic moment in Co is counterbalanced by the larger lattice mismatch between the Co-C (1.6%) and the slightly longer bond length, inducing a magnetic moment in graphene that is similar to that reported in Ni/graphene heterostructures.