Helical surface magnetization in nanowires: the role of chirality.
Helical surface magnetization in nanowires: the role of chirality.
复制标题
纳米线中的螺旋表面磁化：手性的作用。
作者：
S. Ruiz;C. Fernández;E. Martínez;V. Raposo;A. Sorrentino;M. Foerster;L. Aballe;A. Mascaraque;S. Ferrer;L. Pérez
纳米磁性现在正在扩展到三维，这是由新的磁性现象的发现及其在应用中的潜在用途所引发的。这种向3D结构的转变应该伴随着映射相关三维自旋纹理的策略和方法。在这里，我们提出了一个组合的二向色X射线透射显微镜在不同的角度和微磁模拟允许确定的磁性配置的圆柱形纳米线。我们已经将其应用到坡莫合金纳米线与均匀的化学屏障，可以作为钉扎网站域壁。芯部处的磁化是纵向的，并且在线的表面处产生螺旋磁化。不同类型的域壁被发现在钉扎站点，这取决于相邻域的相对手性不同地响应于所施加的字段。
Nanomagnetism is nowadays expanding into three dimensions, triggered by the discovery of new magnetic phenomena and their potential use in applications. This shift towards 3D structures should be accompanied by strategies and methodologies to map the tridimensional spin textures associated. We present here a combination of dichroic X-ray transmission microscopy at different angles and micromagnetic simulations allowing to determine the magnetic configuration of cylindrical nanowires. We have applied it to permalloy nanowires with equispaced chemical barriers that can act as pinning sites for domain walls. The magnetization at the core is longitudinal and generates at the surface of the wire helical magnetization. Different types of domain walls are found at the pinning sites, which respond differently to applied fields depending on the relative chirality of the adjacent domains.