TY - JOUR
T1 - Determining the Proximity Effect-Induced Magnetic Moment in Graphene by Polarized Neutron Reflectivity and X-ray Magnetic Circular Dichroism
AU - Aboljadayel, Razan O.M.
AU - Kinane, Christy J.
AU - Vaz, Carlos A.F.
AU - Love, David M.
AU - Weatherup, Robert S.
AU - Braeuninger-Weimer, Philipp
AU - Martin, Marie Blandine
AU - Ionescu, Adrian
AU - Caruana, Andrew J.
AU - Charlton, Timothy R.
AU - Llandro, Justin
AU - Monteiro, Pedro M.S.
AU - Barnes, Crispin H.W.
AU - Hofmann, Stephan
AU - Langridge, Sean
N1 - Publisher Copyright:
© 2023 The Authors. Published by American Chemical Society
PY - 2023/5/10
Y1 - 2023/5/10
N2 - We report the magnitude of the induced magnetic moment in CVD-grown epitaxial and rotated-domain graphene in proximity with a ferromagnetic Ni film, using polarized neutron reflectivity (PNR) and X-ray magnetic circular dichroism (XMCD). The XMCD spectra at the C K-edge confirm the presence of a magnetic signal in the graphene layer, and the sum rules give a magnetic moment of up to ∼0.47 μB/C atom induced in the graphene layer. For a more precise estimation, we conducted PNR measurements. The PNR results indicate an induced magnetic moment of ∼0.41 μB/C atom at 10 K for epitaxial and rotated-domain graphene. Additional PNR measurements on graphene grown on a nonmagnetic Ni9Mo1 substrate, where no magnetic moment in graphene is measured, suggest that the origin of the induced magnetic moment is due to the opening of the graphene’s Dirac cone as a result of the strong C pz-Ni 3d hybridization.
AB - We report the magnitude of the induced magnetic moment in CVD-grown epitaxial and rotated-domain graphene in proximity with a ferromagnetic Ni film, using polarized neutron reflectivity (PNR) and X-ray magnetic circular dichroism (XMCD). The XMCD spectra at the C K-edge confirm the presence of a magnetic signal in the graphene layer, and the sum rules give a magnetic moment of up to ∼0.47 μB/C atom induced in the graphene layer. For a more precise estimation, we conducted PNR measurements. The PNR results indicate an induced magnetic moment of ∼0.41 μB/C atom at 10 K for epitaxial and rotated-domain graphene. Additional PNR measurements on graphene grown on a nonmagnetic Ni9Mo1 substrate, where no magnetic moment in graphene is measured, suggest that the origin of the induced magnetic moment is due to the opening of the graphene’s Dirac cone as a result of the strong C pz-Ni 3d hybridization.
KW - PNR
KW - XMCD
KW - graphene
KW - heterostructure
KW - magnetism
UR - http://www.scopus.com/inward/record.url?scp=85156223677&partnerID=8YFLogxK
U2 - 10.1021/acsami.2c02840
DO - 10.1021/acsami.2c02840
M3 - Article
C2 - 37092734
AN - SCOPUS:85156223677
SN - 1944-8244
VL - 15
SP - 22367
EP - 22376
JO - ACS Applied Materials and Interfaces
JF - ACS Applied Materials and Interfaces
IS - 18
ER -