"Domain-wall-induced electromagnons in magnetoelectric materials".

Amongst the properties of multiferroic materials, magnetoelectric coupling, which provides a handle for controlling electrical dipole moments by applying magnetic fields (or magnetic moments by electric fields), is promising for the design of novel sensors and data storage media with lower power consumption and higher efficiency. In addition, the potential provided by the existence of electromagnons together with the topological defects such as domain walls opens the opportunity of enhancing the magnetoelectric response as well as creating electrically-driven configurable magnonic circuits. In this work, the observation of dynamical couplings between magnons and optical phonons in systems possessing ferroelectric domains is reported which leads to emergence of new hybrid quasi-particles, namely domain-wall-induced electromagnons and induces THz resonances in magnetoelectric responses. Such quasi-particles are preferentially localized either near the domain walls or near the middle of domains due to scatterings. As a result, larger magnetoelectric conversion is acquired that can be exploited to design more reliable and ultrafast magnetoelectric devices with less energy consumption.