The summary of this thesis, as well as several relevant but unresolved topics for the future study, are provided. In this thesis, we investigated the magnetoelectric response in two typical forms of frustrated spin systems; triangular lattice antiferromagnets and S = 1/2 chain helimagnets. Our results reveal that frustrated magnets can host unique magnetoelectric response (such as non-volatile multiple-valued switching of electric polarization direction by magnetic field or ultrafast control of magnetism by electric field) much more ubiquitously than originally believed, and offer some additional guideline for the material design of such multiferroics compounds. The strong magnetoelectric coupling in magnetically-induced ferroelectrics should also provide many interesting features to various type of topological defects such as domain wall or magnetic vortex; The future investigation of their properties would be very promising.
KeywordsDomain Wall Triangular Lattice Topological Defect Spin Order Magnetoelectric Coupling