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.

magnetic anisotropy

hybrid metal-organic interfaces

X-ray magnetic circular dichroism spectroscopy

rare-earths

AFM exchange coupling

Author

M. Blanco-Rey

Centro de Física de Materiales (CSIC-UPV/EHU)

University of the Basque Country (UPV/EHU)

Donostia International Physics Center

Rodrigo Castrillo

Donostia International Physics Center

Centro de Física de Materiales (CSIC-UPV/EHU)

Khadiza Ali

Donostia International Physics Center

Centro de Física de Materiales (CSIC-UPV/EHU)

Chalmers, Microtechnology and Nanoscience (MC2), Quantum Device Physics

Pierluigi Gargiani

ALBA Synchrotron Light Facility

M. Ilyn

Centro de Física de Materiales (CSIC-UPV/EHU)

Michele Gastaldo

Czech Academy of Sciences

Institut Catala de Nanociencia i Nanotecnologia

Markos Paradinas

Institute of Material Science of Barcelona (ICMAB)

Institut Catala de Nanociencia i Nanotecnologia

Miguel A. Valbuena

Institut Catala de Nanociencia i Nanotecnologia

IMDEA Nanoscience Institute

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)

Donostia International Physics Center

Centro de Física de Materiales (CSIC-UPV/EHU)

F. Schiller

Centro de Física de Materiales (CSIC-UPV/EHU)

L. Fernandez

Centro de Física de Materiales (CSIC-UPV/EHU)

CIC nanoGUNE

Small

1613-6810 (ISSN) 1613-6829 (eISSN)

Vol. In Press

Subject Categories

Condensed Matter Physics

DOI

10.1002/smll.202402328

More information

Latest update

8/23/2024