Computer simulation of magnetization distributions in contiguous-disk bubble devices

Magnetization distributions in actual contiguous-disk (CD) bubble devices were simulated through numerical integration of the Landau-Lifshitz-Gilbert (LLG) equation with the backward Euler method. Six kinds of energy density terms were included in the LLG equation: exchange, uniaxial anisotropy, crystalline anisotropy, stress-induced anisotropy, external field, and demagnetizing field. The stress distributions induced in the actual CD pattern were calculated three-dimensionally by means of finite element method on the analogy of thermal-induced stresses. Potential wells calculated from the magnetization distributions were in good agreement with experiments.