抄録
A new theoretical formulation is proposed on a spin system, which is related to the self-organization of spatially modulated phases and the magnetic multi-valued recording. In this work, macroscopic spin state of the system is determined as a result of a competition between exchange and dipole interactions during the time evolution. Macroscopic patterns are described in linear combinations of periodic functions in Fourier transformed equations with linearized spin interactions. Spins are placed on the lattice points to describe simply this system. Spin configurations can have various symmetrical and asymmetrical patterns even under a uniform external field, according to the balance between interactions. We show that a spatially modulated phase can spontaneously appear by applying just a uniform magnetic field for a finite time interval.
