Computer simulation of spin dynamics for frustration spin glass state in mixed compounds including the competition between ferro- and antiferromagnetic exchange interactions

Dynamic properties of frustration spin glass state in the mixed magnetic compounds including the competition between ferromagnetic and antiferromagnetic exchange (short range) interactions are discussed on the basis of calculated results by the method of spin dynamic simulation (SDS) which has been developed by the present authors. Here, two-dimensional Heisenberg-type mixed compounds are treated in computer simulation. From the discussion by the use of snapshot of spin pattern and chirality map on the square lattice, it is made clear that the frustration spin glass state in mixed Heisenberg-type compounds is characterized with the distinguished localization of chirality on a frustrated plaquette forming the boundary of ferromagnetic domain-like structure. This behavior is striking contrast to that in XY-type mixed compounds where vortex-like structure appears.