Dresden 2017 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 97: Nanostructures at Surfaces: Molecular Systems II
O 97.2: Hauptvortrag
Donnerstag, 23. März 2017, 15:30–16:00, REC/PHY C213
Single-molecule magnets: The influence of the surface — •Katharina Diller — Institute of Physics, École Polytechnique Fédérale de Lausanne (EPFL), Lausanne, Switzerland
A prerequisite for using magnetic nanostructures in data storage applications is magnetic remanence, i.e., magnetization after removal of an external magnetic field. Single-molecule magnets are metal-organic compounds which (below a certain blocking temperature) possess this property. However, the interaction with the environment often leads to fast relaxation of the magnetization, a problem especially prevalent for single-molecule magnets adsorbed on metal supports. Using the example of terbium phthalocyanine double decker (TbPc2) molecules we will discuss the influence of the surface on the magnetic and electronic properties of the adsorbates. The TbPc2 molecules are either deposited by molecular beam epitaxy onto the substrate of choice or are directly created by on-surface metallation, which allows us to selectively probe different scenarios. Using a combination of scanning tunnelling microscopy and X-ray absorption spectroscopy, we show how different decoupling layers enhance the magnetic remanence of TbPc2 and discuss which other factors influence the system.