The Role of Rare‐Earth Atoms in the Anisotropy and Antiferromagnetic Exchange Coupling at a Hybrid Metal–Organic Interface
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/REAu<sub>2</sub> type (RE = Gd, Ho) constitutes a feasible approach toward on-demand magnetic properties and functionalities. The GdAu<sub>2</sub> and HoAu<sub>2</sub> substrates differ in their magnetic anisotropy behavior. Remarkably, the HoAu<sub>2</sub> 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 ( <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:semantics><mml:mi>L</mml:mi> <mml:annotation>$L$</mml:annotation></mml:semantics> </mml:math> ), as it is the case of Ho, induce an anisotropic interfacial exchange coupling.
Authors
- Maxim Ilyn (ORCID: https://orcid.org/0000-0002-4052-7275)
- Pierluigi Gargiani (ORCID: https://orcid.org/0000-0002-6649-0538)
- Miguel A. Valbuena (ORCID: https://orcid.org/0000-0002-0585-5636)
- Frederik Schiller (ORCID: https://orcid.org/0000-0003-1727-3542)
- M. Blanco-Rey (ORCID: https://orcid.org/0000-0002-5189-6690)
- Markos Paradinas (ORCID: https://orcid.org/0000-0003-1006-9506)
- Khadiza Ali (ORCID: https://orcid.org/0000-0001-5780-477X)
- Aitor Mugarza (ORCID: https://orcid.org/0000-0002-2698-885X)
- Michele Gastaldo (ORCID: https://orcid.org/0000-0002-8900-8257)
- Jose Enrique Ortega (ORCID: https://orcid.org/0000-0002-6643-806X)
- Laura Fernández (ORCID: https://orcid.org/0000-0002-4818-1125)
- Rodrigo Castrillo
Institutions
- Madrid Institute for Advanced Studies (ES)
- Institució Catalana de Recerca i Estudis Avançats (ES)
- University of the Basque Country (ES)
- ALBA Synchrotron (Spain) (ES)
- Institut Català de Nanociència i Nanotecnologia (ES)
- CIC nanoGUNE (ES)
- Czech Academy of Sciences, J. Heyrovský Institute of Physical Chemistry (CZ)
- Material Physics Center (ES)
- Institut de Ciència de Materials de Barcelona (ES)
- Donostia International Physics Center (ES)
- Chalmers University of Technology (SE)
Publication Details
- Journal
- Small
- Published
- 2024-08-16
- DOI
- https://doi.org/10.1002/smll.202402328
- Citations
- 2
- Primary Topic
- Advanced Condensed Matter Physics
- Type
- article
- Field-Weighted Citation Impact
- 0.62
Funders
- Ministerio de Ciencia, Innovación y Universidades
- Centres de Recerca de Catalunya
- European Commission
- Deutsche Forschungsgemeinschaft
- Generalitat de Catalunya
- Eusko Jaurlaritza
- Ministerio de Ciencia e Innovación
- Diputación Foral de Gipuzkoa
- Horizon 2020 Framework Programme
- Agencia Estatal de Investigación
- European Social Fund