Спин-волновой резонанс в синтетическом антиферромагнетике [(Co-=SUB=-0.88-=/SUB=-Fe-=SUB=-0.12-=/SUB=-)/Cu]-=SUB=-N-=/SUB=-

The synthetic antiferromagnet [(Co0.88Fe0.12)/Cu]N which is planar composite with ~ 60 nm thickness was researched by the spin-wave resonance technique in all angles range of the applied constant magnetic field relative to normal to the film surface. Our researches demonstrate that studied multilayer film is magnetic superlattice the microwave spectrums of which demonstrate two different exchange-coupled magnetic systems. Every of these subsystems are showing itself as a series spin-wave modes on measured microwave spectrums. The dependence of magnitude of the propagation linear range of standing spin exchange wave on specimen orientation in applied magnetic field was discovered

Point group symmetry and deformation-induced symmetry breaking of superlattice materials

The point group symmetry of materials is closely related to their physical properties and quite important for material modelling. However, superlattice materials have more complex symmetry conditions than crystals due to their multi-level structural feature. Thus, a theoretical framework is proposed to characterize and determine the point group symmetry of non-magnetic superlattice materials systematically. A variety of examples are presented to show the symmetry features of superlattice materials in different dimensions and scales. In addition, the deformation-induced symmetry-breaking phenomenon is also studied for superlattice materials, which has potential application in tuning physical properties by imposing a strain field.