The rare earth iron garnets (REIG) are a technologically important class of materials owing to their ferrimagnetism, low spin damping, large band gaps, high Curie points and chemical stability. Epitaxial REIG films are also capable of producing perpendicular magnetic anisotropy (PMA) which results from the interfacial strain due to lattice mismatch...
Published in Journal of Physics B: Atomic, Molecular and Optical Physics
We theoretically discuss the influence of a squeezed drive on the fast and slow light effect at different temperatures by focusing on two main factors: the nonlinear gain coefficient of optical parametric amplification and the phase of the pumping field. We show that the nonlinear gain coefficient and the phase of the pump field will affect the cou...
In this work, we investigate the structural and dynamic magnetic properties of yttrium iron garnet (YIG) films grown onto gadolinium gallium garnet (GGG) substrates with thin platinum, iridium, and gold spacer layers. Separation of the YIG film from the GGG substrate by a metal film strongly affects the crystalline structure of YIG and its magnetic...
Published in Frontiers in Materials
Virtual materials design requires not only the simulation of a huge number of systems, but also of systems with ever larger sizes and through increasingly accurate models of the electronic structure. These can be provided by density functional theory (DFT) using not only simple local approximations to the unknown exchange and correlation functional...
Dans un matériau ferromagnétique soumis à un fort champ magnétique, l'onde de spin décrit la propagation du déphasage des spin précessant à la même fréquence au cours du temps. Ce travail de thèse présente le développement d'un capteur magnétique, en exploitant les variations dans la propagation de l'onde de spin. Ces dernières années, le sujet de ...
This thesis was aimed at studying the generation, propagation and manipulation of spin-waves in nanostructures of thin films of Y₃Fe₅O₁₂ (YIG) and one of its doped variants (BiYIG), in order to enable the design of spin-wave based signal processing schemes and devices operating at radiofrequencies. Two goals have been pursued in parallel: 1.Provide...
Published in Applied Physics A
The spin Hall magnetoresistance (SMR) at Pt/ Y3Fe5O12(YIG) interfaces with (100)-, (110)- and (111)-oriented YIG films was studied. Before that, high-quality YIG films were fabricated on Gd3Ga5O12 (GGG) substrates by pulsed-laser deposition and the structure, magnetic property and damping of YIG films with different crystallographic orientations we...
Published in Applied Physics A
Samarium substituted yttrium iron garnet powders, Y3−xSmxFe5O12 (x = 0, 0.1, 0.2, 0.4, 0.6, 1), were prepared by Co-precipitation method. The phase structure of synthesized powders examined using X-ray diffraction confirmed the foundation of the cubic structure. The average crystallite size, of the garnets, decreased by 4.5% with increasing Samariu...
Department of Materials Science and Engineering / close
Magnetic material is the key component in lot of electromagnetically-based optical to microwave applications. In the case of radio-frequencies/microwave applications, passive components are developed using planar design to facilitate their fabrication while 3D geometries are the best shapes to improve components properties. But nowadays, 3D printin...
