Graphene-Induced Magnetic Anisotropy of a Two-Dimensional Iron Phthalocyanine Network.
A single layer of flat-lying iron phthalocyanine (FePc) molecules assembled on graphene grown on Ir(111) preserves the magnetic moment, as deduced by X-ray magnetic circular dichroism from the Fe L2,3 edges. Furthermore, the FePc molecules in contact with the graphene buffer layer exhibit an enhancement of the magnetic anisotropy, with emergence of an in-plane easy magnetic axis, reflected by an increased orbital moment of the FePc molecules in contact with the C atoms in the graphene sheet. The origin of the increased magnetic anisotropy is discussed, considering the absence of electronic state hybridization, and the breaking of symmetry upon FePc adsorption on graphene.
†Dipartimento di Fisica, Università di Roma "La Sapienza", Piazzale A. Moro 5, I-00185 Roma, Italy.
Simone
S
Lisi
†Dipartimento di Fisica, Università di Roma "La Sapienza", Piazzale A. Moro 5, I-00185 Roma, Italy.
Pierluigi
P
Gargiani
†Dipartimento di Fisica, Università di Roma "La Sapienza", Piazzale A. Moro 5, I-00185 Roma, Italy.
Mattia
M
Scardamaglia
‡European Synchrotron Radiation Facility - ESRF CS40220, 38043 Grenoble Cedex 9, France.
Nicholas B
NB
Brookes
‡European Synchrotron Radiation Facility - ESRF CS40220, 38043 Grenoble Cedex 9, France.
Violetta
V
Sessi
†Dipartimento di Fisica, Università di Roma "La Sapienza", Piazzale A. Moro 5, I-00185 Roma, Italy.
Carlo
C
Mariani
†Dipartimento di Fisica, Università di Roma "La Sapienza", Piazzale A. Moro 5, I-00185 Roma, Italy.
Maria Grazia
MG
Betti
XAS; XMCD; iridium; organometallic; spin network; surface