Title : Domain Structures and Interfacial Modulation in BiFeO3-based Thin Films

Abstract : Multiferroic materials have shown great potential in future electronics due to multiple order parameters and the corresponding synergistic effects. As a room-temperature single-phase multiferroic material, BiFeO3 possesses abundant phase compositoins, ferroelectric/ferromagnetic domain and domain walls, and magnetoelectric coupling. Especially, the low-dimensional ferroelectric domain walls and magnetoelectric coupling effect provide broad application prospects for BiFeO3 in high-density and low-power consumption nanoelectronics. In this seminar, the preparation of self-assembled BiFeO3 nanoislands will be firstly introduced and the ferroelectric center-type quad domains and conductive domain in those nanostructures will be further elaborated. In addition, the effects of multiferrroic interfacial coupling on magnetic dynamics in the BiFeO3/La0.67Sr0.33MnO3 heterstructure will be presented as well. With the ferromagnetic/antiferromagnetic coupling, new modes of spin-wave propogation and anisotropic ferromagnetic resonance was discovered and the ultra-long distance magnon transmission was also achieved.

Host : Prof. Tae Won Noh