论文标题
手性磁铁MNGE中拓扑自旋纹理的原子尺度可视化
Atomic scale visualization of topological spin textures in the chiral magnet MnGe
论文作者
论文摘要
自旋极化扫描隧道显微镜用于直接在MNGE的薄膜中直接对拓扑磁纹理进行图像，并将磁力与原子尺度探测的结构相关联。我们的图像表明螺旋条纹结构域，每个螺纹条形域以单波向量Q及其相关的helimagnetic域壁为特征，与散装中看到的3Q磁态相反。将我们的表面测量与微磁性建模相结合，推断出螺旋波形的三维方向，并详细了解单个域壁及其相交的结构。我们发现，三个螺旋结构域以两种不同的方式相遇，可以产生“目标状”或“类似Pi”的拓扑旋转纹理，并将其与表面上的局部应变相关联。我们进一步表明，可以通过电流/电压脉冲或施加的磁场来可逆地操纵目标纹理，这是朝着未来应用迈出的有希望的步骤。
Spin polarized scanning tunneling microscopy is used to directly image topological magnetic textures in thin films of MnGe, and to correlate the magnetism with structure probed at the atomic-scale. Our images indicate helical stripe domains, each characterized by a single wavevector Q, and their associated helimagnetic domain walls, in contrast to the 3Q magnetic state seen in the bulk. Combining our surface measurements with micromagnetic modeling, we deduce the three-dimensional orientation of the helical wavevectors and gain detailed understanding of the structure of individual domain walls and their intersections. We find that three helical domains meet in two distinct ways to produce either a "target-like" or a "pi-like" topological spin texture, and correlate these with local strain on the surface. We further show that the target-like texture can be reversibly manipulated through either current/voltage pulsing or applied magnetic field, a promising step toward future applications.
