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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.