Complex 3D magnetic textures in nanomagnets exhibit rich physical properties, e.g., in their dynamic interaction with external fields and currents, and play an increasing role for current technological challenges such as energy-efficient memory devices. To study these magnetic nanostructures including their dependency on geometry, composition, and crystallinity, a 3D characterization of the magnetic field with nanometer spatial resolution is indispensable. Here we show how holographic vector field electron tomography can reconstruct all three components of magnetic induction as well as the electrostatic potential of a Co/Cu nanowire with sub 10 nm spatial resolution. We address the workflow from acquisition, via image alignment to holographic and tomographic reconstruction. Combining the obtained tomographic data with micromagnetic considerations, we derive local key magnetic characteristics, such as magnetization current or exchange stiffness, and demonstrate how magnetization configurations, such as vortex states in the Co-disks, depend on small structural variations of the as-grown nanowire.

纳米磁体中复杂的3D磁性纹理在与外部磁场和电流的动态相互作用中表现出丰富的物理特性，并且在当前的技术挑战（例如节能存储设备）中发挥着越来越重要的作用。为了研究这些磁性纳米结构，包括它们对几何形状，组成和结晶度的依赖性，以纳米空间分辨率对磁场进行3D表征是必不可少的。在这里，我们展示了全息矢量场电子断层扫描如何以低于10 nm的空间分辨率重建磁感应的所有三个分量以及Co / Cu纳米线的静电势。我们致力于解决从采集到图像对齐到全息和断层摄影重建的整个工作流程。将获得的断层扫描数据与微磁考虑因素结合起来，