Measurement of the Induced Magnetic Polarisation of Rotated-Domain Graphene Grown on Co Film with Polarised Neutron Reflectivity
oleh: Razan Omar M. Aboljadayel, Christy John Kinane, Carlos Antonio Fernandes Vaz, David Michael Love, Marie-Blandine Martin, Andrea Cabrero-Vilatela, Philipp Braeuninger-Weimer, Adrian Ionescu, Andrew John Caruana, Timothy Randall Charlton, Justin Llandro, Pedro Manuel da Silva Monteiro, Crispin Henry William Barnes, Stephan Hofmann, Sean Langridge
| Format: | Article |
|---|---|
| Diterbitkan: | MDPI AG 2023-09-01 |
Deskripsi
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 <i>K</i>-edge. From the XMCD sum rules an estimated magnetic moment of 0.3 <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mi>μ</mi></semantics></math></inline-formula><sub>B</sub>/C atom, while a more accurate estimation of 0.49 <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mi>μ</mi></semantics></math></inline-formula><sub>B</sub>/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.