标题： 由移动电荷耦合形成的磁畴壁的形状 显示英文标题

标题： Shape of magnetic domain walls formed by coupling to mobile charges

摘要： 磁畴壁在基础物理和技术应用中都至关重要，由于多种不同的起源，如晶体形状、晶格对称性和磁各向异性，它们通常有特定的形态偏好。我们理论研究了另一种起源于巡游磁体中移动电荷耦合的起源。在巡游磁体的一个最小模型，即具有经典局域自旋的Kondo晶格模型中进行大规模数值模拟，我们表明磁畴壁的形状取决于电子能带结构和电子填充情况。虽然Néel和120反铁磁态在畴壁形状上没有明显的偏好，但具有标量手性有序的非共面自旋态的畴壁形状则根据电子填充情况表现出不同的方向偏好。我们发现这种方向偏好可以通过由移动电荷引起的有效磁相互作用的波数依赖性来解释，这些相互作用由能带结构和电子填充情况决定。我们还观察到，在非共面手性态中，由于自旋贝里相位机制，畴壁上会感应出电流，其空间分布非常不同，这取决于体态是金属还是绝缘体。 显示英文摘要

摘要： Magnetic domain walls, which are crucially important in both fundamental physics and technical applications, often have a preference in their form due to many different origins, such as the crystalline shape, lattice symmetry, and magnetic anisotropy. We theoretically investigate yet another origin stemming from the coupling to mobile charges in itinerant magnets. Performing a large-scale numerical simulation in a minimal model for itinerant magnets, i.e., the Kondo lattice model with classical localized spins, we show that the shape of magnetic domain walls depends on the electronic band structure and electron filling. While Neel and 120 antiferromagnetic states do not show a strong preference in the shape of domain walls, noncoplanar spin states with scalar chiral ordering have distinct directional preferences of the domain walls depending on the electron filling. We find that the directional preference is rationalized by the wave-number dependence of the effective magnetic interactions induced by the mobile charges, which are set by the band structure and electron filling. We also observe that, in the noncoplanar chiral states, an electric current is induced along the domain walls owing to the spin Berry phase mechanism, with very different spatial distributions depending on whether the bulk state is metallic or insulating.