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GraM3 Report Summary

Project ID: 648295
Funded under: H2020-EU.1.1.

Periodic Reporting for period 1 - GraM3 (Surface-grafted metallofullerene molecular magnets with controllable alignment of magnetic moments)

Reporting period: 2015-06-01 to 2016-11-30

Summary of the context and overall objectives of the project

Realization of magnetism on a molecular level is very technologically attractive since it promises a dramatic increase of possible writing densities and offers a number of spintronics applications, including memory storage and quantum computing. Successful development in this direction will result in miniaturization of the devices with concomitant decrease of their energy consumption. These applications require that the magnetic molecules (single molecule magnets, SMM, hereafter) are to be organized on the substrates and their magnetic states are controlled on the single-spin level. The practical realization of such technologies are however hampered by the low temperatures of magnetic phenomena, difficulties in the obtaining of the well-structurally defined layers of SMMs, and fundamental difficulties in “writing” and “reading” information from single molecules. The main goal of this project is to overcome these problems by utilizing unique properties of endohedral metallofullerenes (EMFs) with lanthanide ions as magnetic centers. EMFs are chemically and thermally stable, which allows their further functionalization and implementation in molecular devices. This project is hence focused on the advances in synthesis of the EMFs and development of new EMF molecules with improved magnetic properties, functionalization of the EMF molecules with chemical groups facilitating formation of the single-molecule thick layers on conducting substrates, and on the studies of the magnetic properties of EMFs and their derivatives in bulk and on substrates.

Work performed from the beginning of the project to the end of the period covered by the report and main results achieved so far

At the first stage of the project, we focused on the improvement in the synthesis of EMF molecules, which would allow their faster accumulation and further studies of their chemical and magnetic properties. A number of magnetic EMFs with endohedral Dy atoms have been synthesized in appreciable amounts, and selectivity of the EMF synthesis has been improved via development of the reactive gas approach. This allowed us to start the deep exploration of their magnetic and chemical properties. Several cycloaddition reaction were performed, and the most promising ones were identified. Furthermore, the first chemical derivatives of magnetic EMFs with anchoring groups have been prepared, and preparation of the monolayers have been started. This progress opened the possibility for the studies of their bulk and surfaces magnetism. In parallel, the work on the monolayer formation by organic molecular beam epitaxy with subsequent studies of the layers by scanning tunneling microscopy has been started. Ab initio and DFT computational studies of chemical derivatives, on-surface arrangement, and magnetic properties of pristine and chemically modified EMFs have been performed successfully.

Progress beyond the state of the art and expected potential impact (including the socio-economic impact and the wider societal implications of the project so far)

During the first period of the project, the molecules with unprecedentedly high blocking temperatures of magnetization and unusual mechanisms of relaxation of magnetization have been found. These results open the new way for creation of single molecule magnates with promising magnetic and electronic properties.
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