磁性测量中的一种与几何无关的力矩修正方法3超导量子干涉仪-振动样品磁强计
A geometry-independent moment correction method for the Magnetic Property Measurement 3 Superconducting Quantum Interference Device-Vibrating Sample Magnetometer
摘要：
现代超导量子干涉仪（SQUID）磁强计的灵敏度和自动化能力目前是无与伦比的。然而，由于几何效应，即样本量、形状和径向偏移，测得的力矩值易于偏离其实际值。这是众所周知的，并且知识渊博的操作员将考虑这些影响来校正测量的力矩值。磁性测量3（MPMS 3）磁力计的当前程序基于可用的模拟工具，对振动样品磁力计（VSM）和直流（DC）方法都有效。尽管如此，确定校正因子需要具有明确定义的几何形状的样品以及精确的样品尺寸和通常难以确定的径向偏移。此外，目前还没有一个适当的解决方案来纠正不规则形状样品的几何效应。在这项工作中，我们发现了一个系统的关系之间的差异VSM和直流测量和相应的修正因子MPMS 3 SQUID-VSM设备。对于给定的一对DC扫描长度和VSM幅度值，该关系遵循明确的趋势，与样本大小、形状或径向偏移无关。利用这一趋势，一个几何无关的校正方法，在这里提出并验证了金属铁粉末的测量使用远离最佳样品安装。
英文摘要：
The sensitivity and automation capabilities of modern superconducting quantum interference device (SQUID) magnetometers are currently unmatched. The measured moment values are, however, prone to deviations from their actual value due to geometric effects, namely sample size, shape, and radial offset. This is well known, and a knowledgeable operator will correct measured moment values taking these effects into account. The current procedure for the Magnetic Property Measurement 3 (MPMS3) magnetometer is based on an available simulation tool, valid for both Vibrating Sample Magnetometer (VSM) and Direct Current (DC) methods. Still, determining the correction factor requires samples with well-defined geometric shapes together with accurate sample dimensions and the usually difficult to determine radial offset. Additionally, at the moment, there is not a proper solution to correct geometry effects of irregular shaped samples. In this work, we find a systematic relation between the difference between the VSM and DC measurements and their corresponding correction factors for MPMS3 SQUID-VSM device. This relation follows a clear trend, independent of sample size, shape or radial offset, for a given pair of DC scan length and VSM amplitude values. Exploiting this trend, a geometry-independent correction method is here presented and validated by measurements of metallic Fe powder using a far from optimal sample mounting.
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