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Experimental and Theoretical Study of Magnetic Anisotropy in Linear Trimeric Single Molecule Magnets and Two-Dimensional Molecular Metamagnets : Prospects for Practical Applications

English title Experimental and Theoretical Study of Magnetic Anisotropy in Linear Trimeric Single Molecule Magnets and Two-Dimensional Molecular Metamagnets : Prospects for Practical Applications
Applicant Zaharko Oksana
Number 128078
Funding scheme SCOPES
Research institution Paul Scherrer Institut
Institution of higher education Paul Scherrer Institute - PSI
Main discipline Physical Chemistry
Start/End 01.12.2009 - 30.11.2012
Approved amount 100'000.00
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All Disciplines (4)

Discipline
Physical Chemistry
Theoretical Physics
Inorganic Chemistry
Condensed Matter Physics

Keywords (9)

magnetism; molecules; synthesis; spectroscopy; theory; Molecular Magnetism; Neutron Scattering; Electron Paramagnetic Resonance; Theoretical Analysis

Lay Summary (English)

Lead
Lay summary
This project concerns the comprehensive experimental and theoretical study of different classes of molecular magnets with potential for future technical applications. One class is single molecule magnets (SMMs), which act as tiny bar magnets at low temperatures, another is metamagnets. In principle, a large quantity of information can be stored in a very small amount of these materials, and they are therefore being intensely studied for their applications in quantum computing. Experimental characterization of these systems, primarily using the techniques of Inelastic Neutron Scattering (INS), High-Field Multi-Frequency EPR, polarized neutron diffraction, and DC/AC magnetic susceptibility and magnetization measurements will be complemented by the comprehensive theoretical description of the single ion anisotropy, orbitally-dependent superexchange, Jahn-Teller effect, different relaxation mechanisms, metamagnetic effect etc. The main aim is to reveal the key mechanisms governing the SMM behavior of linear 3d-4f-3d and 3d-5d-3d clusters and the metamagnetic behavior of the two-dimensional molecular magnets. On this basis we plan to design new SMMs with unprecedentedly high blocking temperature and new two-dimensional metamagnetic molecular materials promising for molecular electronics and nanotechnological applications.
Direct link to Lay Summary Last update: 21.02.2013

Responsible applicant and co-applicants

Publications

Publication
Source of magnetic anisotropy in quasi-two-dimensional XY {Cu4(tetrenH5)W(CN)8]4·7.2H2O)}n bilayer molecular magnet
Zaharko O., Pregeli M., Zorko A., Podgajny R., Goukassov A., van Tol J., Ostrovsky S., Klokishner S., Delley B. (2013), Source of magnetic anisotropy in quasi-two-dimensional XY {Cu4(tetrenH5)W(CN)8]4·7.2H2O)}n bilayer molecular magnet, in Physical Review B, 87, 024406.
A Model of Magnetic and Relaxation Properties of the Mononuclear [Pc2Tb]-TBA+ Complex
Reu O.S., Palii A.V., Ostrovsky S.M., Tregenna-Piggott P.L.W., Klokishner S.I. (2012), A Model of Magnetic and Relaxation Properties of the Mononuclear [Pc2Tb]-TBA+ Complex, in Inorganic Chemistry , 51, 10955-10965.
Magnetic Anisotropy In Single Molecule Magnets Containing Transition Metal And Lanthanide Ions: Experimental Study And Theoretical Modeling
Klokishner S. (2012), Magnetic Anisotropy In Single Molecule Magnets Containing Transition Metal And Lanthanide Ions: Experimental Study And Theoretical Modeling.
Source of magnetic anisotropy in a soft layered magnet WCuT
Zaharko O. (2012), Source of magnetic anisotropy in a soft layered magnet WCuT.
Enhancing the Blocking Temperature in Single-Molecule Magnets by Incorporating 3d–5d Exchange Interactions
K.S. Pedersen, M. Schau-Magnussen, J. Bendix, H. Weihe, A. Palii, S. I. Klokishner, S. Ostrovsky, O.S. Reu, H. Mutka, P. L. W. Tregenna-Piggott (2010), Enhancing the Blocking Temperature in Single-Molecule Magnets by Incorporating 3d–5d Exchange Interactions, in Chemistry - A European Journal , 16, 13458-13464.
Modeling of Magnetic and Relaxation Properties of Mononuclear 4f Complexes
Klokishner S. (2010), Modeling of Magnetic and Relaxation Properties of Mononuclear 4f Complexes.
Modeling of Single Molecule Magnets Based on Mononuclear 4f Complexes
Klokishner S. (2010), Modeling of Single Molecule Magnets Based on Mononuclear 4f Complexes.
Origin of Magnetic Anisotropy in Single Molecule and Single Chain Magnets Containing Ions with Unquenched Orbital Angular Momenta
Klokishner S. (2010), Origin of Magnetic Anisotropy in Single Molecule and Single Chain Magnets Containing Ions with Unquenched Orbital Angular Momenta.

Scientific events

Active participation

Title Type of contribution Title of article or contribution Date Place Persons involved
6th International Conference on Materials Science and Condensed Matter Physics 11.09.2012 Chisinau, Moldova
Joint European Magnetic Symposia 2012 09.09.2012 Italy, Parma
17th Sagamore Conference 15.07.2012 RIKEN, Japan
9th International Workshop on Polarized Neutrons in Condensed Matter Investigations 02.07.2012 Paris, France
5th International Conference on Materials Science and Condensed Matter Physics and Symposium In Memoriam of Acad. Boris Lazarenko (1910-1979) “Electrical Methods of Materials Treatment” 13.10.2010 Chisinau, Moldova
20th International Symposium on the Jahn-Teller Effect 16.08.2010 Fribourg, Switzerland


Abstract

This project concerns the comprehensive experimental and theoretical study of linear trinuclear Single Molecule Magnets (SMMs) containing highly anisotropic orbitally degenerate metal ions and two-dimensional (2D) molecular metamagnets. Three new families of compounds of current interest will be investigated: 1) 3d-4f-3d SMMs containing different bivalent 3d ions in combination with different trivalent lanthanide ions, 2) 3d-5d-3d SMMs in which different trivalent 3d-ions are combined with different 5d ions, 3) two-dimensional cyano-bridged W-Cu and Mo-Cu molecular metamagnets. Experimental characterization of these systems, primarily using Inelastic Neutron Scattering (INS) technique, High-Field Multi-Frequency EPR (HFMF EPR), polarized neutron diffraction, DC and AC magnetic susceptibility, magnetization measurements and XMCD studies of molecules on surfaces. The experimental work will be complemented by the comprehensive theoretical description of the single ion anisotropy, orbitally-dependent superexchange, Jahn-Teller effect, different relaxation mechanisms, metamagnetic effect etc. The main aim is to reveal the key mechanisms governing the SMM behavior of linear 3d-4f-3d and 3d-5d-3d clusters and the metamagnetic behavior of the two-dimensional molecular magnets. On this basis we plan to design new SMMs with unprecedentedly high blocking temperature and new two-dimensional metamagnetic molecular materials promising for molecular electronics and nanotechnological applications.
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