X-ray Absorption Spectroscopy; Scanning Tunneling Microscopy; Ultrathin Insulators; Surface Science; Single-Molecule Magnets; Single-Ion Magnets; Magnetic Hysteresis; Magnetic Anisotropy
Krylov Denis S., Schimmel Sebastian, Dubrovin Vasilii, Liu Fupin, Nguyen T. T. Nhung, Spree Lukas, Chen Chia-Hsiang, Velkos Georgios, Bulbucan Claudiu, Westerström Rasmus, Studniarek Michał, Dreiser Jan, Hess Christian, Büchner Bernd, Avdoshenko Stanislav M., Popov Alexey A. (2020), Substrate-Independent Magnetic Bistability in Monolayers of the Single-Molecule Magnet Dy 2 ScN@C 80 on Metals and Insulators, in Angewandte Chemie International Edition
Studniarek Michał, Wäckerlin Christian, Singha Aparajita, Baltic Romana, Diller Katharina, Donati Fabio, Rusponi Stefano, Brune Harald, Lan Yanhua, Klyatskaya Svetlana, Ruben Mario, Seitsonen Ari Paavo, Dreiser Jan (2019), Understanding the Superior Stability of Single‐Molecule Magnets on an Oxide Film, in Advanced Science
Rohlf Sebastian, Grunwald Jan, Jasper-Toennies Torben, Johannsen Sven, Diekmann Florian, Studniarek Michał, Berndt Richard, Tuczek Felix, Rossnagel Kai, Gruber Manuel (2019), Influence of Substrate Electronic Properties on the Integrity and Functionality of an Adsorbed Fe(II) Spin-Crossover Compound, in The Journal of Physical Chemistry C
, 123(29), 17774-17780.
Daffé Niéli, Jiménez Juan-Ramón, Studniarek Michał, Benchohra Amina, Arrio Marie-Anne, Lescouëzec Rodrigue, Dreiser Jan (2019), Direct Observation of Charge Transfer and Magnetism in Fe 4 Co 4 Cyanide-Bridged Molecular Cubes, in The Journal of Physical Chemistry Letters
, 10(8), 1799-1804.
Ramanantoanina Harry, Studniarek Michal, Daffé Niéli, Dreiser Jan (2019), Non-Empirical Calculation of X-ray Magnetic Circular Dichroism in Lanthanide Compounds, in Chemical Communications
, 55(20), 2988-2991.
Rosado Piquer Lidia, Escoda-Torroella Mariona, Ledezma Gairaud Marisol, Carneros Saul, Daffé Niéli, Studniarek Michał, Dreiser Jan, Wernsdorfer Wolfgang, Sañudo E. Carolina (2019), Hysteresis enhancement on a hybrid Dy( iii ) single molecule magnet/iron oxide nanoparticle system, in Inorganic Chemistry Frontiers
Kumar Kuppusamy Senthil, Studniarek Michał, Heinrich Benoît, Arabski Jacek, Schmerber Guy, Bowen Martin, Boukari Samy, Beaurepaire Eric, Dreiser Jan, Ruben Mario (2018), Engineering On-Surface Spin Crossover: Spin-State Switching in a Self-Assembled Film of Vacuum-Sublimable Functional Molecule, in Advanced Materials
, 30(11), 1705416-1705416.
Chen C.-H., Krylov D. S., Avdoshenko S. M., Liu F., Spree L., Westerström R., Bulbucan C., Studniarek M., Dreiser J., Wolter A. U. B., Büchner B., Popov A. A. (2018), Magnetic hysteresis in self-assembled monolayers of Dy-fullerene single molecule magnets on gold, in Nanoscale
, 10(24), 11287-11292.
Single-molecule magnets (SMMs) are molecular coordination clusters exhibiting slow relaxation of magnetization which is manifested in the appearance of a magnetic hysteresis. SMMs and their mononuclear counterparts, single-ion magnets (SIMs), are attracting a lot of interest because of their high potential for molecular spintronics applications. In order to exploit the interesting properties of SMMs and SIMs in devices, which could be built based on molecule-inorganic heterostructures, a thorough understanding of the properties of the molecule-inorganic interface is needed. In several recent studies it has been observed that the magnetization relaxation times of TbPc2 SIMs are strongly reduced when the molecules are deposited on conducting surfaces such as metal single crystalline surfaces or on highly oriented pyrolitic graphite (HOPG). In their latest, currently submitted, work, the applicant and coworkers were able to show that the magnetization relaxation times of TbPc2 SIMs are drastically prolonged when an ultrathin insulating magnesium oxide film is inserted between the SIMs and the metallic substrate. In this project we will build up on these promising results. We aim at obtaining a thorough understanding of the influence of the substrate and the insulating film on the dynamic magnetic properties of surface deposited SIMs by a careful choice of substrate materials and decoupling films. To this end, an attractive option is to deposit submonolayers of TbPc2 molecules on sodium chloride ultrathin films with varying thickness. The sodium chloride films will be grown on metallic, e.g., Ag(100), and semiconducting (Ge(100)) surfaces. The semiconducting substrates further allow for the unique opportunity of tuning the charge carrier density, including the possibility of n-type and p-type doping. This shall yield information about the detailed interaction mechanism of the SIMs with the free charge carriers in the substrate, separated by the ultrathin insulating film acting as a tunnelling barrier. The studies will be performed by means of X-ray magnetic circular dichroism, scanning tunnelling microscopy at low temperatures and X-ray photoelectron spectroscopy at the X-Treme and the PEARL beam lines of the Swiss Light Source, Paul Scherrer Institut, Switzerland. The synthesis and purification of the TbPc2 molecules will be carried out in the group of Prof. Mario Ruben at the Karlsruhe Institute of Technology, Germany.The knowledge gained in the proposed studies shall lead to an improved control of the dynamic magnetic properties of surface adsorbed SMMs and SIMs. This project, if successful, has the potential to reach a milestone in the field of molecular spintronics with SMMs and SIMs, regarding the applicability of SMMs and SIMs in spintronics devices.