Araujo Jefferson F D F, Reis Andre L A, Correa Angela A P, Yokoyama Elder, Oliveira Vanderlei C, Mendoza Leonardo A F, Pacheco Marcos A C, Luz-Lima Cleanio, Santos Amanda F, Osorio G Fredy G, Brito Giancarlo E, Araujo Wagner W R, Bruno Antonio C, Del Rosso Tommaso
Department of Physics, Pontifical Catholic University of Rio de Janeiro, Rio de Janeiro 22451-900, Brazil.
Department of Geophysics, National Observatory, Rio de Janeiro 20921-400, Brazil.
Materials (Basel). 2019 Dec 11;12(24):4154. doi: 10.3390/ma12244154.
Scanning magnetic microscopy is a tool that has been used to map magnetic fields with good spatial resolution and field sensitivity. This technology has great advantages over other instruments; for example, its operation does not require cryogenic technology, which reduces its operational cost and complexity. Here, we presented a spatial domain technique based on an equivalent layer approach for processing the data set produced by magnetic microscopy. This approach estimated a magnetic moment distribution over a fictitious layer composed by a set of dipoles located below the observation plane. For this purpose, we formulated a linear inverse problem for calculating the magnetic vector and its amplitude. Vector field maps are valuable tools for the magnetic interpretation of samples with a high spatial variability of magnetization. These maps could provide comprehensive information regarding the spatial distribution of magnetic carriers. In addition, this approach might be useful for characterizing isolated areas over samples or investigating the spatial magnetization distribution of bulk samples at the micro and millimeter scales. This technique could be useful for many applications that require samples that need to be mapped without a magnetic field at room temperature, including rock magnetism.
扫描磁显微镜是一种用于绘制具有良好空间分辨率和场灵敏度的磁场的工具。该技术相对于其他仪器具有很大优势；例如，其操作不需要低温技术，这降低了其运营成本和复杂性。在此，我们提出了一种基于等效层方法的空间域技术，用于处理磁显微镜产生的数据集。这种方法估计了由位于观测平面下方的一组偶极子组成的虚拟层上的磁矩分布。为此，我们制定了一个线性反问题来计算磁矢量及其幅度。矢量场图是用于对具有高磁化空间变异性的样品进行磁解释的有价值工具。这些图可以提供有关磁性载体空间分布的全面信息。此外，这种方法可能有助于表征样品上的孤立区域或研究微米和毫米尺度上块状样品的空间磁化分布。该技术对于许多需要在室温下无磁场映射样品的应用可能很有用，包括岩石磁性。
