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Tuning the magnetization relaxation times of surface supported single-molecule magnets by ultrathin decoupling layers

English title Tuning the magnetization relaxation times of surface supported single-molecule magnets by ultrathin decoupling layers
Applicant Dreiser Jan
Number 165774
Funding scheme Project funding (Div. I-III)
Research institution Synchrotron Lichtquelle Schweiz Paul Scherrer Institut
Institution of higher education Paul Scherrer Institute - PSI
Main discipline Condensed Matter Physics
Start/End 01.01.2017 - 31.12.2018
Approved amount 177'048.00
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All Disciplines (2)

Discipline
Condensed Matter Physics
Inorganic Chemistry

Keywords (8)

X-ray Absorption Spectroscopy; Scanning Tunneling Microscopy; Ultrathin Insulators; Surface Science; Single-Molecule Magnets; Single-Ion Magnets; Magnetic Hysteresis; Magnetic Anisotropy

Lay Summary (German)

Lead
Einzelmolekülmagnete sind Komplexverbindungen aus organischen Liganden und Metallionen, die die Orientierung ihrer Magnetisierung für eine längere Zeit aufrechterhalten können. Hierbei stellt jedes Molekül ein Quanten-Spinsystem mit diskreten Energiezuständen dar. Dies eröffnet die Möglichkeit, solche Moleküle zur Verarbeitung und Speicherung von Informationen zu verwenden. Dabei ist es hilfreich, dass die nanometergrossen Moleküle in sehr grosser Zahl und mit sehr hoher Reinheit hergestellt werden können. Um die Moleküle nutzbar zu machen, müssen sie adressiert werden können, was zum Beispiel durch Aufbringung auf Oberflächen erreicht werden kann. Allerdings wurde in den letzten Jahren erkannt, dass die magnetischen Eigenschaften der Moleküle durch die Oberfläche selbst oft im negativen Sinn verändert werden.
Lay summary

Das Ziel des Projekts ist, durch geeignete Oberflächen die Eigenschaften der Einzelmolekülmagnete zu erhalten oder sogar zu verbessern. Dass dies möglich ist, hat eine erste Untersuchung von TbPc2 Einzelmolekülmagneten auf dünnen Magnesiumoxid-Schichten ergeben. Auf solchen isolierenden Schichten wurde die höchste jemals beobachtete Remanenz, d.h. Erhaltung der Molekül-Magnetisierung ohne externes Magnetfeld, der TbPc2 Moleküle festgestellt. Es sollen andere isolierende Schichten zur Verbesserung der Einzelmolekülmagnete geprüft werden. Ausserdem sollen die Mechanismen, die zu der beachtlichen Remanenz der TbPc2 Moleküle auf Magnesiumoxid führen, genauer erforscht werden.

Die gewonnenen Ergebnisse werden einen fundamentalen Einblick in die Wechselwirkung zwischen magnetischen Einheiten auf Oberflächen, getrennt durch Isolatorschichten, geben. Aus technologischer Sicht sind die Ergebnisse wertvoll für die Entwicklung von molekularer Elektronik.

Direct link to Lay Summary Last update: 07.10.2016

Responsible applicant and co-applicants

Employees

Name Institute

Publications

Publication
Substrate-Independent Magnetic Bistability in Monolayers of the Single-Molecule Magnet Dy 2 ScN@C 80 on Metals and Insulators
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, 0.
Understanding the Superior Stability of Single‐Molecule Magnets on an Oxide Film
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, 1901736-1901736.
Influence of Substrate Electronic Properties on the Integrity and Functionality of an Adsorbed Fe(II) Spin-Crossover Compound
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.
Direct Observation of Charge Transfer and Magnetism in Fe 4 Co 4 Cyanide-Bridged Molecular Cubes
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.
Non-Empirical Calculation of X-ray Magnetic Circular Dichroism in Lanthanide Compounds
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.
Hysteresis enhancement on a hybrid Dy( iii ) single molecule magnet/iron oxide nanoparticle system
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.
Engineering On-Surface Spin Crossover: Spin-State Switching in a Self-Assembled Film of Vacuum-Sublimable Functional Molecule
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.
Magnetic hysteresis in self-assembled monolayers of Dy-fullerene single molecule magnets on gold
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.

Collaboration

Group / person Country
Types of collaboration
Prof. Mario Ruben Germany (Europe)
- in-depth/constructive exchanges on approaches, methods or results
- Publication
- Research Infrastructure
Dr. Matthias Muntwiler, Paul Scherrer Institut Switzerland (Europe)
- in-depth/constructive exchanges on approaches, methods or results
- Publication
- Research Infrastructure
- Exchange of personnel

Scientific events

Active participation

Title Type of contribution Title of article or contribution Date Place Persons involved
International Conference on Molecule-Based Magnets (ICMM) Talk given at a conference Stabilizing the Magnetic Moment of LnPc2 SMMs Using Ultrathin MgO Films 04.09.2018 Rio de Janeiro, Brazil Dreiser Jan;
ICMM/Workshop on Advanced Nanomaterials Characterization Talk given at a conference Shedding Light on Functional Molecular Magnetic Interfaces 31.08.2018 Campinas, Brazil Dreiser Jan;
Intl. Conference on X-ray Absorption Fine Structure Talk given at a conference Slowing down magnetization relaxation of lanthanide phthalocyanine double deckers using a thin oxide film 26.07.2018 Krakow, Poland Studniarek Michal;
Jahrestagung der Dt. Physikalischen Gesellschaft Talk given at a conference Slowing Down Magnetization Relaxation of Lanthanide Phthalocyanine Double and Triple Deckers Using a Thin Oxide Film 15.03.2018 Berlin, Germany Studniarek Michal;
Seminar der Physik der kondensierten Materie, Uni Basel Individual talk Reaching Magnetic Stability of Single-Molecule Magnets by Ultrathin Insulating Films 23.10.2017 Universitaet Basel, Switzerland Dreiser Jan;
QMol - Operating Quantum States in Atoms and Molecules on Surfaces Poster Slowing down magnetization relaxation of lanthanide phthalocyanine double and triple deckers using a thin oxide film 10.09.2017 Monte Verita, Ascona, Switzerland Studniarek Michal;
EUROPEAN CONFERENCE ON SURFACE SCIENCE (ECOSS) Talk given at a conference Giant hysteresis of singlemolecule magnets adsorbed on a nonmagnetic insulator 27.08.2017 Szeged, Hungary Dreiser Jan;


Associated projects

Number Title Start Funding scheme
182599 Selective Resonant Optical Excitations and Spin Pumping in Functional Magnetic Materials 01.01.2019 Project funding (Div. I-III)

Abstract

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.
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