磁性纳米粒子的扫描磁显微镜表征新方法
New method for characterization of magnetic nanoparticles by scanning magnetic microscopy
摘要：
在本文中，我们提出了一种新的方法，用于块体材料，微结构和纳米结构的磁性表征。利用扫描磁显微镜（SMM）对化学沉淀法（共沉淀法）和脉冲激光烧蚀法（PLA）制备的氧化铁（Fe 3 O 4）磁性纳米粒子（MNP）的磁性和形貌进行了研究。我们评估了这种技术的性能，通过比较磁化曲线和商业磁力计，被认为是标准的测量。饱和磁化强度和剩余磁化强度的误差分别约为0.18 Am 2/kg和0.6 Am 2/kg。从磁化曲线测量估计的纳米颗粒的平均尺寸分布与通过传统的透射电子显微镜（TEM）获得的结果是一致的。该技术可以扩展到测量和分析磁化曲线（磁滞回线），从而能够更准确地估计整体NP尺寸。
英文摘要：
In this paper, we present a new method for the magnetic characterization of bulk materials, microstructures, and nanostructures. We investigated the magnetic and morphological properties of two colloidal dispersions of iron oxide (Fe3O4) magnetic nanoparticles (MNPs), synthesized by chemical precipitation (co-precipitation) and pulsed laser ablation (PLA) in liquid, by scanning magnetic microscopy (SMM) applied to a small sample with mass on the order of tens of μg. We evaluated the performance of this technique by comparing magnetization curves and measurements obtained with commercial magnetometers, considered standard. The errors obtained for the saturation and remanent magnetization were approximately 0.18 Am2/kg and 0.6 Am2/kg, respectively. The average size distribution of the NPs estimated from the magnetization curve measurements is consistent with the results obtained by traditional transmission electron microscopy (TEM). The technique can be extended to measure and analyze magnetization curves (hysteresis loops), thus enabling an even more accurate estimation of overall NP sizes.
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