Measurement of the Induced Magnetic Polarisation of Rotated-Domain Graphene Grown on Co Film with Polarised Neutron Reflectivity

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

doi:10.3390/nano13192620

Nanomaterials (Sep 2023)

Measurement of the Induced Magnetic Polarisation of Rotated-Domain Graphene Grown on Co Film with Polarised Neutron Reflectivity

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

Affiliations

Razan Omar M. Aboljadayel: Cavendish Laboratory, Physics Department, University of Cambridge, Cambridge CB3 0HE, UK
Christy John Kinane: ISIS Facility, STFC Rutherford Appleton Laboratory, Harwell Science and Innovation Campus, Oxon OX11 0QX, UK
Carlos Antonio Fernandes Vaz: Swiss Light Source, Paul Scherrer Institut (PSI), 5232 Villigen, Switzerland
David Michael Love: Cavendish Laboratory, Physics Department, University of Cambridge, Cambridge CB3 0HE, UK
Marie-Blandine Martin: Department of Engineering, University of Cambridge, Cambridge CB3 0FA, UK
Andrea Cabrero-Vilatela: Department of Engineering, University of Cambridge, Cambridge CB3 0FA, UK
Philipp Braeuninger-Weimer: Department of Engineering, University of Cambridge, Cambridge CB3 0FA, UK
Adrian Ionescu: Cavendish Laboratory, Physics Department, University of Cambridge, Cambridge CB3 0HE, UK
Andrew John Caruana: ISIS Facility, STFC Rutherford Appleton Laboratory, Harwell Science and Innovation Campus, Oxon OX11 0QX, UK
Timothy Randall Charlton: ISIS Facility, STFC Rutherford Appleton Laboratory, Harwell Science and Innovation Campus, Oxon OX11 0QX, UK
Justin Llandro: Cavendish Laboratory, Physics Department, University of Cambridge, Cambridge CB3 0HE, UK
Pedro Manuel da Silva Monteiro: Cavendish Laboratory, Physics Department, University of Cambridge, Cambridge CB3 0HE, UK
Crispin Henry William Barnes: Cavendish Laboratory, Physics Department, University of Cambridge, Cambridge CB3 0HE, UK
Stephan Hofmann: Department of Engineering, University of Cambridge, Cambridge CB3 0FA, UK
Sean Langridge: ISIS Facility, STFC Rutherford Appleton Laboratory, Harwell Science and Innovation Campus, Oxon OX11 0QX, UK

DOI: https://doi.org/10.3390/nano13192620
Journal volume & issue: Vol. 13, no. 19
p. 2620

Abstract

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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 μB/C atom, while a more accurate estimation of 0.49 μB/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.

Published in Nanomaterials

ISSN: 2079-4991 (Online)
Publisher: MDPI AG
Country of publisher: Switzerland
LCC subjects: Science: Chemistry
Website: https://www.mdpi.com/journal/nanomaterials

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