论文标题
具有偶极 - 偶极相互作用的多层铁磁体系统的相图
Phase diagram of multi-layer ferromagnet system with dipole-dipole interaction
论文作者
论文摘要
我们研究了薄膜磁铁中偶极 - 偶极相互作用（DDI）引起的各种磁性构型在开放边界条件下与垂直方向异性引起的。模拟了两种不同的方法：一种从随机磁性构型开始，并逐步降低温度。另一个从饱和的平面外铁磁状态开始，以评估其亚稳定性。作为典型的磁构型模式，发现了五种典型的配置：平面外铁磁，平面非平面铁磁，涡流，多域和倾斜多域状态。值得注意的是，倾斜的多域形成了由开放边界条件产生的，具有平面涡流结构的同心磁性域模式。关于强制性，两个过程中磁性构型的比较表明，平面外铁磁状态在多域状态下表现出亚稳定性，而不在涡旋状态。我们还确认，最初在平面各向异性系统中讨论的所谓的neel-CAP磁性瘤结构出现在多域状态。
We investigate various magnetic configurations caused by the dipole-dipole interaction (DDI) in the thin-film magnet with the perpendicular anisotropy under the open boundary conditions. Two different approaches are simulated: one starts from a random magnetic configuration and decreases temperatures step-wisely; the other starts from the saturated out-of-plane ferromagnetic state to evaluate its metastability. As typical patterns of magnetic configuration, five typical configurations are found: an out-of-plane ferromagnetic, in-plane ferromagnetic, vortex, multi-domain, and canted multi-domain states. Notably, the canted multi-domain forms a concentric magnetic-domain-pattern with an in-plane vortex structure, resulting from the open boundary conditions. Concerning to the coercivity, a comparison of the magnetic configurations in both processes reveals that the out-of-plane ferromagnetic state exhibits metastability in the multi-domain state, while not in the vortex state. We also confirm that the so-called Neel-cap magnetic-domain-wall structure, which is originally discussed in the in-plane anisotropy system, appears at the multi-domain state.
