论文标题
新的微观磁性哈密顿量用于金属中的外来自旋纹理
New Microscopic Magnetic Hamiltonian for Exotic Spin Textures in Metals
论文作者
论文摘要
我们为Rashba偶联的双交换金属提供了一种新的微观自旋汉密尔顿。除标准各向同性术语外，哈密顿量还包括Dzyaloshinskii-Moriya（DM）和Kitaev形式的各向异性相互作用。我们通过将结果与精确的自旋特性模型的结果进行比较来验证自旋哈密顿量，并使用大型蒙特卡洛模拟介绍其相图。除了铁磁，平面螺旋和通量状态外，该模型还携带了Skyrmion晶体和经典的自旋液态状态，分别通过多个峰和旋转结构因子中的弥散环模式表征。自旋液体状态下的丝状结构域壁结构与MNSI-Type B20金属和过渡金属及其合金的薄膜实验数据非常吻合。
We derive a new microscopic spin Hamiltonian for Rashba-coupled double exchange metals. The Hamiltonian consists of anisotropic interactions of the Dzyaloshinskii-Moriya (DM) and Kitaev form, in addition to the standard isotropic term. We validate the spin Hamiltonian by comparing results with those on the exact spin-fermion model, and present its phase diagram using large scale Monte Carlo simulations. In addition to ferromagnetic, planar spiral and flux states, the model hosts skyrmion crystal and classical spin-liquid states characterized, respectively, by multiple peaks and a diffuse ring pattern in the spin structure factor. The filamentary domain wall structures in the spin-liquid state are in remarkable agreement with experimental data on thin films of MnSi-type B20 metals and transition metals and their alloys.
