Domains and domain walls in multiferroics - Fritz-Haber

Fritz-Haber-Institut der Max-Planck-Gesellschaft
Physikalische Chemie — Direktor: Prof. Dr. Martin Wolf
Department Seminar:
Monday, February 20, 2017, at 11:00 a.m.;
— all are invited to meet at around 10:40 for a chat and coffee —
Prof. Dr. Manfred Fiebig
Laboratory for Multifunctional Ferroic Materials,
Department of Materials, ETH Zürich.
Domains and domain walls in multiferroics
Richard-Willstätter-Haus, Faradayweg 10
A. Paarmann
Abstract:
The functionality of any ferroic material depends on its domains. Consequently, their
shape and manipulation in external fields are of major interest. In compounds uniting
magnetic and electric order in the same phase, the magnetoelectric coupling on the
level of the domains is, however, largely unexplored. For such so-called multiferroics it
is therefore not known how exactly the electric or magnetic fields affect the
multiferroic domains and their walls. In my talk I will discuss this issue. In particular, I
will discuss magnetic-field control of a ferroelectric domains and vice versa. I will
show that domain walls in multiferroics can be considered as new, mobile type of
functional ferroic interface. Finally, I will present an example of all-optical control of a
multiferroic state. The core technologies for us to access to multiferroic domains and
their walls is nonlinear optics, here in the form of doubling of a laser frequency in a
material..

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