Synthèse et propriétés d'hétérostructures moléculaires de type multiferroïque à base d'analogues du Bleu de Prusse

Morgane Presle 1
1 Chimie du solide
LPMC - Laboratoire de physique de la matière condensée
Abstract : The originality of the project developed during this thesis was based on the synthesis and the study of photo-magnetic heterostructures in a temperature range convenient for applications. The approach consisted of developing multiferroic-like heterostructures that associate a piezomagnetic phase and a photo-strictive phase. The idea was to exploit the coupling of elastic origin between these properties, to allow the observation of photo-magnetic effects at temperatures higher than those reported for single-phase materials. The photo-strictive phase can deform under light irradiation, generating biaxial strain in the magnetic phase. If the piezomagnetic response of the latter is high enough, its magnetisation could be modulated, especially at the vicinity of the Curie temperature. In this project, we focused on molecular solids based on polycyanometallates, namely Prussian blue analogues, whose generic formula is AxM[M'(CN)6]y . zH2O (where A is an alkali metal and M,M transition metals). The main objective of this work was the controlled growth of core-shell particles based on these Prussian Blue derivatives, focusing on Rb0,5Co[Fe(CN)6]0,8 . zH2O for the photo-strictive phase and Rb0,2Ni[Cr(CN)6]0,7 . z'H2O for the magnetic phase. We developed a protocol for controlling the chemical composition of the shell, thereby limiting interdiffusion phenomena at the interface. The second point was the characterisation of the structural arrangement across the interface, to clarify the epitaxial relationships and the polycrystalline nature of the shell. Finally, magnetisation changes under light irradiation were investigated.
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Morgane Presle. Synthèse et propriétés d'hétérostructures moléculaires de type multiferroïque à base d'analogues du Bleu de Prusse. Matériaux. Ecole Polytechnique X, 2011. Français. ⟨pastel-00680566⟩

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