Scientists Design New Magnet With Extraordinary Properties

Representation of molecular-based magnetic images and their magnetic properties. Credit: Rodolphe Clérac

The new lightweight magnet has the possibility of real world applications.

An international team of researchers led by the Center de Recherche Paul Pascal (UMR 5031, CNRS -University of Bordeaux) has discovered a novel way to design magnets that have extraordinary physical properties, that can complement them, or even compete with traditional inorganic magnets , which is widely used in everyday devices.

Magnets are an integral part of our daily lives and are found in many medical and electronic devices, including household appliances, electric motors, and computers. Demand for new magnetic materials has increased significantly in recent years. Many such materials are made of metal elements or rare earth metals that can be used at room temperature. In 2019, the global market for inorganic magnets is estimated at US $ 19.5 billion, and is expected to reach US $ 27.5 billion by 2025. However, inorganic magnets can be expensive to form and access to their constituent elements is often limited.

Over the years, chemists have been trying to create high-performance magnets with low energy and financial costs using large units of metal ion molecules and cheap organic ligands. So far, very few magnet-molecules operating at room temperature have been reported, and some of the described examples cannot store information.

The new magnet has the possibility of real world applications

An international team of researchers led by CNRS researcher Rodolphe Clérac at the University of Bordeaux has discovered a new chemical strategy for designing a magnetic coordination network made up of organic radicals (a molecule with unpaired electrons, thus carrying spin) and paramagnetic (metal) ions metals to produce very strong magnetic interactions. This new magnet has many desired physical properties, including high operating temperature (up to 242 ° C), high coercivity (ie the ability to store information) and low density.

New lightweight magnet with a density of about 1.2 g cm-3 vs more than 5 g cm-3 for traditional inorganic magnets indicates a large room temperature coefficient of up to 7500 Oe (2 orders of magnitude higher than previously reported for molecular-based systems) and a higher operating temperature that exceeds the current record for coordination networks over 100 ° C. for its remarkable physical properties, the process of synthesizing these magnets is relatively straightforward, and can be easily applied to many metal-organic materials for conversion to metal-organic magnets.

Although it is very easy to prepare new magnets, they are very sensitive and crystal weak, but researchers are able to overcome these obstacles to fully form these magnets. Electronic and magnetic properties are characterized by the selection of elements through a number of international collaborations. While the emission of BM01 and ID12 in the European Synchrotron Research Facility (ESRF) is key to understanding this material about the structure and properties of its magnets, however, fellow researcher of the new Finnish Academy Aaron Mailman contributed to the analytical and spectroscopic characteristics of these magnets.

The synthetic strategies used in this work should be widely applied to related systems and while these results represent new benchmarks for growth and critical temperature, at low density, lightweight metallic-organic magnets, I hope future results will lead to further improvement and real application technology-world ” said Aaron Mailman.

Rodolphe Clérac said “” Honestly, I did not consider my research application before doing this, as my team and I do basic science, but now it is clear to me that we can potentially use this material in magnetoelectronic, magnetic sensors and recording technology, especially when weight is problems, for example, on a smartphone or satellite, “he concluded.

References: “Metal-organic magnets with high durability and order temperature up to 242 ° C” by Panagiota Perlepe, Itziar Oyarzabal, Aaron Mailman, Morgane Yquel, Mikhail Platunov, Iurii Dovgaliuk, Mathieu Rouzières, Philippe Négrier, Denise Mondieig, Elizaveta A. Suturina, Marie-Anne Dourges, Sébastien Bonhommeau, Rebecca A. Musgrave, Kasper S. Pedersen, Dmitry Chernyshov, Fabrice Wilhelm, Andrei Rogalev, Corine Mathonière and Rodolphe Clérac, 30 October 2020, Science,
DOI: 10.1126 / science.abb3861

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