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>Visualization and quantification of inhomogeneous and anisotropic magnetic fields by polarized neutron grating interferometry
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Visualization and quantification of inhomogeneous and anisotropic magnetic fields by polarized neutron grating interferometry
The intrinsic magnetic moment of a neutron, combined with its charge neutrality, is a unique property which allows the investigation of magnetic phenomena in matter. Here we present how the utilization of a cold polarized neutron beam in neutron grating interferometry enables the visualization and characterization of magnetic properties on a microscopic scale in macroscopic samples. The measured signal originates from the phase shift induced by the magnetic potential. Our method enables the detection of previously inaccessible magnetic field gradients, in the order of T cm−1, extending the probed range by an order of magnitude. We visualize and quantify the phase shift induced by a well-defined square shaped uniaxial magnetic field and validate our experimental findings with theoretical calculations based on Hall probe measurements of the magnetic field distribution. This allows us to further extend our studies to investigations of inhomogeneous and anisotropic magnetic field distribution.
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机译：中子的固有磁矩及其电荷中性是一种独特的特性，可以研究物质中的磁现象。在这里，我们介绍中子光栅干涉测量中冷极化中子束的利用如何在宏观样本中的微观尺度上实现磁特性的可视化和表征。测得的信号起源于由磁势引起的相移。我们的方法能够检测以前无法访问的磁场梯度（T cm -1 ），从而将探测范围扩大了一个数量级。我们可视化和量化由定义明确的方形单轴磁场引起的相移，并通过基于霍尔探针测量磁场分布的理论计算来验证我们的实验结果。这使我们可以将研究进一步扩展到非均匀和各向异性磁场分布的研究。
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