Ground states for a layered ferromagnet with dipole-dipole interactions

双極子相互作用をする層状強磁性体の基底状態

横田 光史   

Yokota, Terufumi

Ground state phase diagram for a three-layered Heisenberg ferromagnet with the magnetic anisotropy and the dipole-dipole interactions are inferred from the linear analysis of the fastest growing mode for the time-dependent Ginzburg-Landau equation. It is also investigated numerically by solving the Landau-Lifshitz equation for the model. The phase diagrams obtained from the two methods resemble each other. There are in-plane ferromagnetic state and states with out-of-plane stripe orders. Although the phase diagram is similar to that for the corresponding two-dimensional model qualitatively, the region of the in-plane ferromagnetic state shrinks considerably compared to that for the two-dimensional model.