Johannsen Sven, Robles Roberto, Weismann Alexander, Ridier Karl, Berndt Richard, Gruber Manuel
Institut für Experimentelle und Angewandte Physik, Christian-Albrechts-Universität zu Kiel, 24098, Kiel, Germany.
Centro de Física de Materiales CFM/MPC (CSIC-UPV/EHU), 20018, Donostia-San Sebastián, Spain.
Angew Chem Int Ed Engl. 2024 Dec 16;63(51):e202411865. doi: 10.1002/anie.202411865. Epub 2024 Oct 24.
Spin-crossover compounds can be switched between two stable states with different magnetic moments, conformations, electronic, and optical properties, which opens appealing perspectives for technological applications including miniaturization down to the scale of single molecules. Although control of the spin states is crucial their direct identification is challenging in single-molecule experiments. Here we investigate the spin-crossover complex [Fe(HB(1,2,4-triazol-1-yl))] on a Cu(111) surface with scanning tunneling microscopy and density functional theory calculations. Spin crossover of single molecules in dense islands is achieved via electron injection. Spin-flip excitations are resolved in scanning tunneling spectra in a magnetic field enabling the direct identification of the molecular spin state, and revealing the existence of magnetic anisotropy in the HS molecules.
自旋交叉化合物可以在具有不同磁矩、构象、电子和光学性质的两个稳定状态之间切换，这为包括缩小到单分子尺度的小型化在内的技术应用开辟了有吸引力的前景。尽管自旋态的控制至关重要，但在单分子实验中直接识别它们具有挑战性。在这里，我们用扫描隧道显微镜和密度泛函理论计算研究了在Cu(111)表面上的自旋交叉配合物[Fe(HB(1,2,4 - 三唑 - 1 - 基))]。通过电子注入实现了密集岛中单个分子的自旋交叉。在磁场中的扫描隧道谱中分辨出自旋翻转激发，从而能够直接识别分子自旋态，并揭示高自旋分子中磁各向异性的存在。
