Magnetic nanocomposites consisting of ferrite nanoparticles and magnetic metals have been of interest for use in power electronic components due to their ability to achieve relatively high magnetic permeabilities while also having low losses. Unfortunately, fabrication challenges limit the maximum achievable thickness of these films to ∼ 4 µm, though thicker films are desirable for increased power handling. To overcome these challenges this works seeks to demonstrate a fabrication method whereby thick composite films can be made by constructing sequential composite layers, performing electrophoretic deposition and electro-infiltration steps for each layer. Composite samples of iron oxide nanoparticles electro-infiltrated with nickel that are 1, 3, 5, 7, and 10 layers thick will be fabricated and characterized both structurally and magnetically. Structural measurements accomplished with SEM show that each layer appears to contribute 4 µm to the total thickness, with the one layer sample being 3.99 ± 0.12 µm thick and the ten layer sample being 39.19 ± 3.1 µm thick. Results show that the dc magnetic properties of these composites stay constant as thickness increases, having an average magnetic saturation of 464 kA/m, and coercivity of 2.5 kA/m. The ac magnetic properties similarly showed that the permeability of the composites also stayed consistent at 20. However, the dimensional resonance frequency of the composites decreased as thickness increased, lowering to ∼ 96 MHz for 1 layer (∼4 µm) to ∼ 8 MHz for 10 layers (∼40 µm), revealing a trade-off between thickness of a maximum operating frequency.

由铁氧体纳米颗粒和磁性金属组成的磁性纳米复合材料在电力电子元件中的使用受到关注，因为它们能够实现相对较高的磁导率同时还具有低损耗。不幸的是，制造挑战将这些薄膜的最大可实现厚度限制在 4 µm，尽管更厚的薄膜对于增加功率处理是可取的。为了克服这些挑战，这项工作试图展示一种制造方法，通过构建连续复合层，对每层进行电泳沉积和电渗透步骤，可以制造厚复合膜。将制造 1、3、5、7 和 10 层厚的用镍电渗透的氧化铁纳米颗粒的复合样品，并在结构和磁性上进行表征。使用 SEM 完成的结构测量表明，每一层似乎对总厚度的贡献为 4 µm，其中一层样品的厚度为 3.99 ± 0.12 µm，十层样品的厚度为 39.19 ± 3.1 µm。结果表明，这些复合材料的直流磁性能随着厚度的增加而保持不变，平均磁饱和度为 464 kA/m，矫顽力为 2.5 kA/m。交流磁性能同样表明复合材料的磁导率也保持在 20。然而，复合材料的尺寸共振频率随着厚度的增加而降低，降低到 1 层（约 4 µm）的约 96 MHz 到约 8 MHz 的10 层 (∼40 µm)，揭示了最大工作频率厚度之间的权衡。