点探针磁光法探测氧化铁纳米粒子的磁化动力学

IF 4.1 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY Frontiers in Nanotechnology Pub Date : 2023-08-10 DOI:10.3389/fnano.2023.1214313
Xuyiling Wang, D. Cabrera, Ying Yang, N. Telling
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引用次数: 0

摘要

磁性纳米颗粒(MNPs)有望成为交流磁场下磁热疗的局部热发生器。MNP的加热效率由AC磁滞回线面积决定,而AC磁滞回线区域又受纳米颗粒的动态磁特性的影响。虽然基于电感的交流磁力计可以测量样品的平均磁行为,但使用具有聚焦激光点的磁光法拉第效应可以进行点探针测量,并且没有电感方法施加的一些磁场限制。在这项工作中,通过交流磁强计和交流磁化率技术测量了悬浮液中不同尺寸氧化铁MNP的交流磁性。使用商用感应交流磁强计验证了磁光磁强计测量的交流磁滞回线,并将其与拟合交流磁化率数据所揭示的磁化弛豫行为进行了比较。点探针磁光方法的空间灵敏度也通过测量在载玻片上干燥的大(>1μm)MNP聚集体的AC磁滞回线来证明。发现这些聚集的颗粒比悬浮液形式的颗粒更软,这表明当纳米颗粒形成致密的聚集体时,可能会发生颗粒间耦合机制。
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Probing magnetization dynamics of iron oxide nanoparticles using a point-probe magneto-optical method
Magnetic nanoparticles (MNPs) are promising as local heat generators for magnetic hyperthermia under AC magnetic fields. The heating efficacy of MNPs is determined by the AC hysteresis loop area, which in turn is affected by the dynamic magnetic properties of the nanoparticles. Whilst inductive-based AC magnetometers can measure the average magnetic behavior of samples, the use of the magneto-optical Faraday effect with a focused laser spot allows point-probe measurements to be made, and without some of the magnetic field limitations imposed by inductive methods. In this work, the AC magnetic properties of different sized iron oxide MNPs in suspension were measured by AC magnetometry and AC susceptibility techniques. AC hysteresis loops measured by magneto-optical magnetometry were validated using a commercial inductive AC magnetometer, and compared to the magnetization relaxation behavior revealed by fitting the AC susceptibility data. The spatial sensitivity of the point-probe magneto-optical method is also demonstrated by measuring the AC hysteresis loop from large (>1 μm) MNP aggregates dried onto glass slides. These aggregated particles are found to be magnetically softer than in their suspension form, suggesting interparticle coupling mechanisms could occur when the nanoparticles form dense aggregates.
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来源期刊
Frontiers in Nanotechnology
Frontiers in Nanotechnology Engineering-Electrical and Electronic Engineering
CiteScore
7.10
自引率
0.00%
发文量
96
审稿时长
13 weeks
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