Wysin G M
Department of Physics, Kansas State University, Manhattan, KS 66506-2601, United States of America.
J Phys Condens Matter. 2021 Nov 22;34(6). doi: 10.1088/1361-648X/ac3609.
The uniform states of a model for one-dimensional chains of thin magnetic islands on a nonmagnetic substrate coupled via dipolar interactions are described here. Magnetic islands oriented with their long axes perpendicular to the chain direction are assumed, whose shape anisotropy imposes a preference for the dipoles to point perpendicular to the chain. The competition between anisotropy and dipolar interactions leads to three types of uniform states of distinctly different symmetries, including metastable transverse or remanent states, transverse antiferromagnetic states, and longitudinal states where all dipoles align with the chain direction. The stability limits and normal modes of oscillation are found for all three types of states, even including infinite range dipole interactions. The normal mode frequencies are shown to be determined from the eigenvalues of the stability problem.
本文描述了通过偶极相互作用耦合的非磁性衬底上薄磁岛一维链模型的均匀态。假设磁岛的长轴垂直于链方向，其形状各向异性使得偶极倾向于垂直于链指向。各向异性与偶极相互作用之间的竞争导致了三种具有明显不同对称性的均匀态，包括亚稳横向或剩余态、横向反铁磁态以及所有偶极与链方向对齐的纵向态。即使包括无限范围的偶极相互作用，也找到了所有这三种态的稳定性极限和振荡的正常模式。正常模式频率由稳定性问题的本征值确定。
