The magnetic state, including the stray fields, of a chiral pattern of interacting permalloy nanomagnets is studied using off-axis electron holography in the transmission electron microscope. The projected in-plane magnetisation of the nanomagnets is reconstructed from the experimental magnetic phase shift using model-based iterative reconstruction. The thickness and chemical composition of the nanomagnets are characterised in cross-sectional geometry. The average value of the magnetic polarisation of the permalloy through the thickness of the sample is measured to be 0.73 T. This value is lower than the bulk value of 1 T, likely as a result of a combination of the microstructure, composition and possible oxidation of the nanomagnets. The experimental results are compared to micromagnetic simulations to confirm the magnetic states and to understand the switching processes in the magnetic nanoislands.

在透射电子显微镜中使用离轴电子全息术研究相互作用的坡莫合金纳米磁铁的手征模式的磁性状态，包括杂散场。纳米磁体的投影面内磁化强度是使用基于模型的迭代重建从实验磁相移重建的。纳米磁铁的厚度和化学成分以横截面几何形状为特征。通过样品厚度测得的坡莫合金磁极化平均值为 0.73 T。该值低于 1 T 的整体值，可能是由于微观结构、成分和可能的氧化作用的综合结果的纳米磁铁。