The Role of Rare-Earth Atoms in the Anisotropy and Antiferromagnetic Exchange Coupling at a Hybrid Metal–Organic Interface
Journal article, 2024
Magnetic anisotropy and magnetic exchange interactions are crucial parameters that characterize the hybrid metal–organic interface, a key component of an organic spintronic device. It is shown that the incorporation of 4f RE atoms to hybrid metal–organic interfaces of CuPc/REAu2 type (RE = Gd, Ho) constitutes a feasible approach toward on-demand magnetic properties and functionalities. The GdAu2 and HoAu2 substrates differ in their magnetic anisotropy behavior. Remarkably, the HoAu2 surface promotes the inherent out-of-plane anisotropy of CuPc, owing to the match between the anisotropy axis of substrate and molecule. Furthermore, the presence of RE atoms leads to a spontaneous antiferromagnetic exchange coupling at the interface, induced by the 3d–4f superexchange interaction between the unpaired 3d electron of CuPc and the 4f electrons of the RE atoms. It is shown that 4f RE atoms with unquenched quantum orbital momentum ((Formula presented.)), as it is the case of Ho, induce an anisotropic interfacial exchange coupling.
hybrid metal-organic interfaces
magnetic anisotropy
rare-earths
AFM exchange coupling
X-ray magnetic circular dichroism spectroscopy
Author
M. Blanco-Rey
Spanish National Research Council (CSIC)
Donostia International Physics Center
University of the Basque Country (UPV/EHU)
Rodrigo Castrillo
Donostia International Physics Center
Spanish National Research Council (CSIC)
Khadiza Ali
Spanish National Research Council (CSIC)
Donostia International Physics Center
Chalmers, Microtechnology and Nanoscience (MC2), Quantum Device Physics
Pierluigi Gargiani
ALBA Synchrotron Light Facility
M. Ilyn
Spanish National Research Council (CSIC)
Michele Gastaldo
Czech Academy of Sciences
Institut Catala de Nanociencia i Nanotecnologia
Markos Paradinas
Spanish National Research Council (CSIC)
Institut Catala de Nanociencia i Nanotecnologia
Miguel A. Valbuena
IMDEA Nanoscience Institute
Institut Catala de Nanociencia i Nanotecnologia
Aitor Mugarza
Institut Catala de Nanociencia i Nanotecnologia
Catalan Institution for Research and Advanced Studies
J. Enrique Ortega
University of the Basque Country (UPV/EHU)
Spanish National Research Council (CSIC)
Donostia International Physics Center
F. Schiller
Spanish National Research Council (CSIC)
L. Fernandez
CIC nanoGUNE
Spanish National Research Council (CSIC)
Small
1613-6810 (ISSN) 1613-6829 (eISSN)
Vol. 20 45 2402328Subject Categories (SSIF 2011)
Condensed Matter Physics
DOI
10.1002/smll.202402328