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Isotopic Enrichments of lanthanide based single molecule magnets

Abstract : Molecular materials, and in particular those based on Lanthanides, have been extensively studied for their use in data storage, spintronics and quantum computing, as they promise high anisotropic systems and magnetic bistability of the discrete entity. Actually, in Athe last twenty-five years a plethora of compounds have been reported, thus showing slow of their magnetic relaxation and the characteristic magnetic hysteresis at low temperature. Moreover, some of the last investigations have reach blocking temperatures (temperature for which the system shows superparamagnetic behavior) at the liquid nitrogen level, hence facilitating the applicability of devices based on these molecules. However, the slow relaxation is commonly accompanied by quantum phenomena, favoring a fasten relaxation. The quantum effects open the possibility to different magnetic objects, but only if the operating mechanisms are well known. Dipolar interactions, with the neighboring molecules, and hyperfine interactions, with the metal ion, are known to be some of the reasons why this fast relaxations occurs. With the aim of acquiring a better understanding of the quantum events, and the contribution of the different interactions, different systems have been chosen to be studied in this work. Thus, the synthesis and magnetic characterization of magnetically diluted (suppression of dipolar interactions) and isotopic enrichment (tuning of the hyperfine interactions) of the different systems have been performed in order to find a general direction for the optimization of the slow relaxation process.
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https://tel.archives-ouvertes.fr/tel-02511872
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Submitted on : Thursday, March 19, 2020 - 10:30:13 AM
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  • HAL Id : tel-02511872, version 1

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Jessica Flores Gonzalez. Isotopic Enrichments of lanthanide based single molecule magnets. Inorganic chemistry. Université Rennes 1, 2019. English. ⟨NNT : 2019REN1S064⟩. ⟨tel-02511872⟩

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