JCJC - Jeunes chercheuses & jeunes chercheurs

– fdp magnets

Submission summary

Tremendous amount of work on molecular-based magnets has been reported in the literature. - Such magnetic compounds and particularly zero-dimensional clusters (so-called Single Molecule - Magnets, SMMs) are currently subjects to spectacular interest since original magnetic materials - with high-density information storage potential can be anticipated. Different strategies along with - flourishing experimental techniques have been developed to investigate the unusual physical - properties of these magnetic molecules and nanowires (Single Chain Magnets, SCMs). Even - though these systems are not strictly 3D ordered compounds, the presence of hysterisis loop - below a blocking temperature is a reminiscence of classical magnets. - With this goal in mind, different synthetic routes - have been considered and are currently subject to intense work. - A detailed understanding of the magnetic phenomena in sophisticated - architectures becomes rapidly unreachable since different subtle mechanisms are likely to - compete. The traditional rationalization proceeds through the use of the well-known Heisenberg - Hamiltonian which introduces effective magnetic coupling constants J. A more sophisticated - approach calls for the participation of anisotropic contributions D and E in a generalized picture. - Even though these phenomenological treatments have turned out to be extremely valuable in a - comprehensive analysis of experimental data, the underlying physical phenomena still deserve - special attention. In particular, how much the respective exchange and anisotropy terms have the - ability to account for such intricate interactions is questionable. Besides, to what extent bridging - ligands remain diamagnetic (innocent) as magnetic interactions between metallic centres are - turned on. Even if such partitioning between physical effects and within magnetic moieties may - not be straightforward, one can think of promising synthetic routes of magnetic systems. - The fdp magnets project we plan to pursue relies on complementary experimental and - theoretical skills. Considering the growing interest for 4f-based materials and their potential - applications, there is a real need for theoretical analysis. Even though some methodologies and - phenomenological approaches are available, DFT as well as ab initio techniques would be - extremely insightful in the understanding of heavy-elements magnetic properties. Our project - combines the synthesis of original and well-characterized prototype objects and the - implementation of demanding calculations. Some architectures of ours are already available for - theoretical inspection. However, specific objects which should hold controlled magnetic - interactions will be prepared in the future to get a thorough understanding of the microscopic - interactions. The association of f, d and p spin carriers within the same molecular objects is a - challenging synthetic target, while understanding their physico-chemistry and more specifically - their magnetic properties is an attractive theoretical problem. - ...

Project coordination

Vincent ROBERT (Autre établissement d’enseignement supérieur)

The author of this summary is the project coordinator, who is responsible for the content of this summary. The ANR declines any responsibility as for its contents.

Partner

Help of the ANR 132,000 euros
Beginning and duration of the scientific project: - 36 Months

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