DzyaloshinskiiMoriyainteraktioner

Dzyaloshinskii-Moriya interactions, often abbreviated as DMI, are a type of antisymmetric exchange interaction between magnetic moments in a material. Unlike the more common Heisenberg exchange, which favors parallel or antiparallel alignment of spins, DMI favors a canted or twisted arrangement of spins. This interaction arises from spin-orbit coupling in materials lacking inversion symmetry. The DMI Hamiltonian typically takes the form of a cross product between the spin vectors of neighboring magnetic moments, often with a vector D representing the direction and strength of the interaction. The presence of DMI can lead to the formation of fascinating magnetic textures such as chiral domain walls and skyrmions. These topological spin structures have significant implications for spintronic devices due to their stability and potential for low-power manipulation. Materials exhibiting significant DMI include certain heavy metal/ferromagnet multilayers like Pt/Co and interfaces with specific crystal structures. Understanding and controlling DMI is crucial for designing next-generation magnetic memory and logic devices.