Araujo, J. F. D. F., A. L. A. Reis, A. A. P. Correa, E. Yokoyama, V. C. Oliveira Jr., L. A. F. Mendoza, M. A. C. Pacheco, C. Luz-Lima, A. F. Santos, F. G. Osorio G., G. E. Brito, W. W. R. Araujo, Tahir, A. C. Bruno and T. Del Rosso (2019). Scanning magnetic microscope using a gradiometric configuration for characterization of rock samples. Materials, 12(24), 4154. doi: 10.3390/ma12244154
This paper is part of a scientific collaboration between Observatório Nacional and Pontifical Catholic University of Rio de Janeiro in scanning magnetic microscopy.
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.