第5回物理工学科教室談話会[Prof. Manfred Fiebig・9/13(金)10:30～]

講　師：Prof. Manfred Fiebig
所　属：Department of Materials, ETH Zurich, Switzerland (Fellow, School of Engineering, The University of Tokyo)
題　目：Domain walls in multiferroics and multiferroic domain walls
日　時：2024 年 9 月 13 日(金)10:30~
Date and Time: September 13, 2024 (Friday) 10:30-
場　所：工 6 号館 1 階大会議室 (対面のみ)
Place: Large Conference room, 1st floor, Engineering Bldg. 6 (in-person only)

Abstract:
A reason for the interest in multiferroics is that magnetic and electric orders do not simply exist side by side, but exhibit "added value" in the form of magnetoelectric interactions and functionalities between the ordered states. Likewise, in a ferroic material, regions with different orientation of the order parameter, the domains, do not simply exist side by side, but they exhibit new phases and properties in the domain walls. Because of their discontinuous, confined, and topological nature, domain walls exhibit functional states that are not possible in the bulk. Continuing this line of thought, one should expect domain walls in multiferroics to be a particularly rich source of novel phenomena. Here one must distinguish between (i) "domain walls in multiferroics", where only the ferroelectric (or magnetic) order is considered so that little is learned about the multiferroic state, and (ii) "multiferroic domain walls" where the ferroic phase coexistence of the wall itself is of interest. The latter are rarely studied, and I will discuss some of their intriguing features in my talk.

紹介教員：木村 剛 教授(物理工学専攻)、高橋 陽太郎 准教授(量子相エレクトロニクス研究センター)