由热磁测量确定磁性纳米颗粒尺寸分布
Determining Magnetic Nanoparticle Size Distributions from Thermomagnetic Measurements
摘要：
热磁测量用于获得磁性纳米颗粒的尺寸分布和各向异性。描述了一种分析变换方法，该方法利用温度相关的零场冷却（ZFC）磁化数据来提供超顺磁性纳米颗粒的平均直径和相对丰度的定量测量。将这种方法应用于MnAs-GaAs复合膜中的自组装MnAs纳米颗粒，揭示了与块状材料相比纳米颗粒的对数正态尺寸分布和降低的各向异性。这种分析技术有望快速评估的超顺磁性纳米粒子的合奏的尺寸分布。
英文摘要：
Thermomagnetic measurements are used to obtain the size distribution and anisotropy of magnetic nanoparticles. An analytical transformation method is described which utilizes temperature-dependent zero-field cooling (ZFC) magnetization data to provide a quantitative measurement of the average diameter and relative abundance of superparamagnetic nanoparticles. Applying this method to self-assembled MnAs nanoparticles in MnAs-GaAs composite films reveals a log-normal size distribution and reduced anisotropy for nanoparticles compared to bulk materials. This analytical technique holds promise for rapid assessment of the size distribution of an ensemble of superparamagnetic nanoparticles.
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