Regensburg 2025 – scientific programme
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MA: Fachverband Magnetismus
MA 34: Molecular Magnetism
MA 34.5: Talk
Thursday, March 20, 2025, 10:30–10:45, H18
Annealing Induced Ordered Structures of H2Pc Monolayer on γ'-Fe4N Thin Film — •Hiroki Ono1, Yoshitaka Umeda1, Kaito Yoshida1, Kenzaburo Tsutsui1, Kohei Yamamoto2, Osamu Ishiyama2, Toshihiko Yokoyama2, Masaki Mizuguchi1, and Toshio Miyamachi1 — 1Nagoya University, Nagoya, Japan — 2Institute for Molecular Science, Okazaki, Japan
Organic-inorganic hybrid interface has been studied because its interfacial spin state can be controlled through proximity effect. Spin state depends on local interface structures as well as electronic interaction between organic molecules and magnetic substrates. Therefore, controlling the interface structure is essential but remains challenging because of strong interaction between organic and inorganic materials.
In this work, we fabricate organic-inorganic hybrid thin films using iron nitride as a ferromagnetic substrate and phthalocyanine(H2Pc) as an organic molecule. Iron nitride atomic layers with γ'-Fe4N stoichiometry uniformly grow and show weaker interaction than typical ferromagnetic substrate. Therefore, γ'-Fe4N is a candidate to create structurally controlled interface. We investigate interface structure by using scanning tunneling microscopy(STM) and low energy electron diffraction(LEED), and electronic/magnetic properties by using x-ray absorption spectroscopy/magnetic circular dichroism(XAS/XMCD). We confirm the magnetic coupling occurs at H2Pc/γ'-Fe4N bilayer interface from XAS/XMCD results. H2Pc monolayer on γ'-Fe4N bilayer do not have any long-range lattice manner. But, we find annealing induces well-ordered structure while preserving interface magnetic coupling.
Keywords: organic-inorganic hybrid interface; magnetic coupling; scanning tunneling microscopy; phthalocyanine