Magnetic Moir\'e Systems: a review

This review synthesizes recent advancements in the study of moir\'e magnetism. This emerging field, at the intersection of twistronics, topology, and strongly correlated systems, explores novel phenomena that arise when moir\'e potentials influence the magnetism of two-dimensional systems. The manuscript presents recent advances highlighting the interfacial incongruity as a novel mechanism for regulating the magnetism of two-dimensional materials and for the manifestation of various phenomena in twisted and mismatched magnetic two-dimensional interfaces. The manuscript addresses seminal and recent experimental and theoretical advances associated with both small- and large-period magnetic moir\'e lattices, including novel magnetic phases, low-energy and topological magnetic excitations, magnetic and electronic transport, optical properties, phase transitions, and prospective applications of these materials. Moir\'e magnetism signifies a promising frontier for manipulating complex quantum states in quantum matter. The ongoing advances in this field are poised to impact condensed matter physics, materials science, and quantum information science.