Zoom (https://snu-ac-kr.zoom.us/j/83818088305?pwd=NkRvaHplNHdBb2E5S3lnTWYwbXV1UT09)

                      * ID: 838 1808 8305 / PW: 384976

 
Abstract : The 5d-transition metal oxides have become a fertile ground for studies of new physics driven by spin-orbit interactions. Iridates exhibit a variety of phenomena rare in 3d and 4d counterparts. Because of the reduced Coulomb interactions of extended 5d orbitals, the strong spin-orbit interaction of iridates is vigorously competes with Coulomb interactions and crystal electric field, and critically biases their mutual competition to stabilize ground states with exotic behaviors. Over the years, with the development of oxide thin film growth technologies, high quality epitaxial heterostructures can be achieved at atomic scale. Many novel interface-related properties in iridates, such as synthetic antiferromagnets, topological Hall effect, and spin Hall effect, further promoted the interest of iridates. In this talk, we review the underlying physical properties of the iridates heterostructures, and report our recent results of emphasizing the fabrication of Ruddlesden-Popper type Sr_n+1Ir_nO_3n+1 (n = 1, 2, ∞) epitaxial thin films by pulsed laser deposition. We realized the modulation of magnetoelectric performance in several correlated perovskite oxide heterostructures. The modulation mechanism including the coupling relationship between crystal structure and magnetoelectric properties in these perovskite oxide heterostructures are also discussed. We hope to rebalance comparable interactions and generate a rich physical property in such materials with strong competing interactions.

Host : Prof. Tae Won Noh