Chirality Magnetism and Magnetoelectricity : Separate Phenomena and Joint Effects in Metamaterial Structures Chiral coupling to magnetodipolar radiation Surface plasmons for absolute chiral sensing Spin polarized plasmonics: fresh view on magnetic nanoparticles Charility and Antiferromagnetism in Optical Metasurfaces Anomalous functions due to chiral interplay between light and nanostructures Spin wave nonreciprocity in ferromagnetic materials Microwave Active Dynamics of Magnetic Skyrmions: Magnetic Resonances Translational Motions and Spin Motive Forces Chiral Optomagnonics with Polarized Light in Magnetic Insulators Realization of artificial chirality in micro nano scale three dimensional plasmonic structures Photo induced nonlinear and non equilibrium phenomena in magnets: Floquet engineering application of topological light and spin current generation Stable propagation of surface plasmon polaritons. This book discusses theoretical and experimental advances in metamaterial structures which are of fundamental importance to many applications in microwave and optical wave physics and materials science. Metamaterial structures exhibit time reversal and space inversion symmetry breaking due to the effects of magnetism and chirality. The book addresses the characteristic properties of various symmetry breaking processes by studying field matter interaction with use of conventional electromagnetic waves and novel types of engineered fields: twisted photon fields toroidal fields and magnetoelectric fields. In a system with a combined effect of simultaneous breaking of space and time inversion symmetries one observes the magnetochiral effect. Another similar phenomenon featuring space time inversion symmetries is related to use of magnetoelectric materials. Cross coupling of the electric and magnetic components in these material structures leading to the appearance of new magnetic modes with an electric excitation channel – electromagnons and skyrmions – has resulted in a wealth of strong optical effects such as directional dichroism magnetochiral dichroism and rotatory power of the fields. This book contains multifaceted contributions from international leading experts and covers the essential aspects of symmetry breaking effects including theory modeling and design proven and potential applications in practical devices fabrication characterization and measurement. It is ideally suited as an introduction and basic reference work for researchers and graduate students entering this field.