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MA: Fachverband Magnetismus
MA 46: Surface Magnetism
MA 46.4: Vortrag
Freitag, 21. März 2025, 10:15–10:30, H19
Anisotropic magnetic exchange in a metal-organic interface with 4f electrons: the case of Cu Phthalocyanine on HoAu2 and GdAu2 — •María Blanco-Rey1,2,3, Rodrigo Castrillo3, Frederik M. Schiller3,2, and Laura Fernández3 — 1Universidad del País Vasco UPV/EHU, Spain — 2Donostia International Physics Center DIPC, Spain — 3Centro de Física de Materiales MPC-CSIC-UPV/EHU, Spain
Heterostructures formed by organic molecules on ferromagnetic substrates merge optoelectronic and spintronic functionalities. We have studied CuPc molecules deposited on monolayer-thick REAu2 (RE=Ho, Gd) alloys, which exhibit long-range commensurability and vacuum level pinning of the LUMO. Many-body electron interactions renormalize the molecular levels. Here trivalent Ho and Gd species favour a downward shift of the HOMO, approaching ambipolarity [1]. The Curie temperatures are reduced from ∼ 20 K to ∼ 15 K due to CuPc, as the hybrid interfacial electronic structure affects the RKKY-mediated RE-RE exchange. The spin-orbit coupling of the RE leads to a dependence of the CuPc-RE antiferromagnetic exchange coupling constant Jex on the field orientation, following the orbitally-dependent exchange (ODE) mechanism. ODE is enhanced by the large L=6 value of trivalent Ho, yielding a ratio Jex∥ / Jex⊥ = 4.2, while the anisotropy is weak in the presence of Gd, with a half-field 4f shell [2].
[1] R. Castrillo et al, Nanoscale, 15, 4090 (2023).
[2] M. Blanco-Rey et al, Small, 20, 2402328 (2024).
Keywords: Rare earth; Antiferromagnetism; Molecular magnet; Anisotropy; Spin-orbit