Electrophoretic deposition of iron oxide nanoparticles to achieve thick nickel/iron oxide magnetic nanocomposite films
Electrophoretic deposition of iron oxide nanoparticles to achieve thick nickel/iron oxide magnetic nanocomposite films
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DOI：
10.1063/1.5129797
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发表时间：
2020-01-01
期刊：
影响因子：
1.6
通讯作者：
Andrew, Jennifer S.
中科院分区：
文献类型：
--
作者：
Mills, Sara C.;Smith, Connor S.;Andrew, Jennifer S.
对于现代开关电源，当前的块状磁性材料（例如铁氧体或磁性金属合金）不能提供低损耗和高磁饱和以在高频（10-100 MHz）下以高功率密度和高效率两者运行。由铁氧体和磁性金属合金组成的磁性纳米复合材料提供了实现这些期望的磁性能的机会，但是先前研究的薄膜制造技术难以实现提供实用的磁能存储和功率处理所必需的多微米膜厚度。在这里，我们提出了一种通用的技术，通过两步工艺制造厚的磁性纳米复合材料，包括电泳沉积的铁氧化物纳米颗粒相到模具上的基板上，然后通过电渗透的镍矩阵。通过扫描电子显微镜和能量色散X射线光谱对沉积的膜进行成像，以识别铁和镍的存在，确认镍在氧化铁纳米颗粒之间的渗透。通过触针轮廓测定法测量的膜厚度接近7 μ m。用振动样品磁强计进一步证实了复合材料的成功形成，表明复合材料的饱和磁化强度值（473 kA/m）福尔斯落在氧化铁纳米颗粒的饱和磁化强度值（280 kA/m）和镍基体的饱和磁化强度值（555 kA/m）之间。这些结果表明，电泳沉积耦合电渗透制备磁性纳米复合薄膜的潜力。
For modern switching power supplies, current bulk magnetic materials, such as ferrites or magnetic metal alloys, cannot provide both low loss and high magnetic saturation to function with both high power density and high efficiency at high frequencies (10-100 MHz). Magnetic nanocomposites comprised of a ferrite and magnetic metal alloy provide the opportunity to achieve these desired magnetic properties, but previously investigated thin-film fabrication techniques have difficulty achieving multi-micrometer film thicknesses which are necessary to provide practical magnetic energy storage and power handling. Here, we present a versatile technique to fabricate thick magnetic nanocomposites via a two-step process, consisting of the electrophoretic deposition of an iron oxide nanoparticle phase into a mold on a substrate, followed by electro-infiltration of a nickel matrix. The deposited films are imaged via scanning electron microscopy and energy dispersive X-ray spectroscopy to identify the presence of iron and nickel, confirming the infiltration of the nickel between the iron oxide nanoparticles. A film thickness of similar to 7 mu m was measured via stylus profilometry. Further confirmation of successful composite formation is obtained with vibrating sample magnetometry, showing the saturation magnetization value of the composite (473 kA/m) falls between that of the iron oxide nanoparticles (280 kA/m) and the nickel matrix (555 kA/m). These results demonstrate the potential of electrophoretic deposition coupled with electro-infiltration to fabricate magnetic nanocomposite films.