Si
les premiers pas de l’électronique de spin se sont faits à partir de
systèmes métalliques, c’est grâce aux oxydes que les dernières grandes
avancées dans ce domaine ont été rendues possibles et ce sont encore les
oxydes qui sont les plus prometteurs en termes de nouvelles
fonctionnalités.
La structure cristalline des oxydes est souvent complexe et rend leur élaboration difficile, mais cette complexité, qui permet d’envisager des interactions entre spin, charge, moment orbital et réseau cristallin, rend possible une très grande modularité de leurs propriétés. Cela fait des oxydes un vaste champ d’étude dont on est encore bien loin d’avoir épuisé le potentiel, aussi bien en amont, côté élaboration, pour les chimistes des matériaux, qu’en aval, côté applications, pour les physiciens des systèmes. D’une manière générale, la recherche dans ce domaine a pour point de départ l’étude de composés déjà connus, leur élaboration sous forme de monocristaux ou films minces d’excellente qualité cristalline (par ablation laser pulsé ou par sputtering), la détermination de l’origine exacte de leurs propriétés, la modélisation théorique de ces propriétés, et enfin la proposition de pistes d’optimisation de ces propriétés. C’est par un aller-retour entre expérience (élaboration-propriétés) et théorie que de nouveaux matériaux répondant aux besoins des dispositifs pourront être créés.
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