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Matériaux multiferroïques : structure, ordres et couplages. Une étude par spectroscopie Raman

Abstract : Multiferroics are materials in which magnetic, electric and elastic orders can coexist in the same phase. These orders can be coupled to each other and their study of high interest to understand the mecanisms at stake in the multiferroic materials. This PhD thesis has been focused on the study of several multiferroic compounds by the mean of Raman spectroscopy. In bismuth ferrite (BiFeO₃), the effect of strain on the magnetic order, both on thin films (epitaxial strain) and single crystals (hydrostatic pressure), has been thoroughly investigated. This thesis also focuses on the study of hybrid magneto-electric excitations (electromagnons) in type II multiferroic compounds with strong ferroelectric polarizations such as CaMn₇O₁₂ and TbMnO₃. Furthermore, phonons modes and of low energy excitations have been measured and studied (especially under magnetic field) in compounds with frustrated magnetic orders such as h-YMnO₃, h-YbMnO₃ and in the niobium iron langasite (Ba₃NbFe₃Si₂O₁₄).
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Constance Toulouse. Matériaux multiferroïques : structure, ordres et couplages. Une étude par spectroscopie Raman. Science des matériaux [cond-mat.mtrl-sci]. Université Paris-Saclay, 2016. Français. ⟨NNT : 2016SACLS179⟩. ⟨tel-01377474⟩

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