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Open AccessArticle

Scanning Magnetic Microscope Using a Gradiometric Configuration for Characterization of Rock Samples

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Department of Physics, Pontifical Catholic University of Rio de Janeiro, Rio de Janeiro 22451–900, Brazil
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Department of Geophysics, National Observatory, Rio de Janeiro 20921-400, Brazil
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Institute of Geosciences, University of Brasília, Brasília 70910-900, Brazil
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Department of Electrical Engineering, State University of Rio de Janeiro, Rio de Janeiro 20550-900, Brazil
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Department of Electrical Engineering, Pontifical Catholic University of Rio de Janeiro, Rio de Janeiro 22451–900, Brazil
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Department of Physics, Federal University of Piauí, Teresina 64049-550, PI, Brazil
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Institute of Physics, University of São Paulo, São Paulo 05508-090, Brazil
*
Author to whom correspondence should be addressed.
Materials 2019, 12(24), 4154; https://doi.org/10.3390/ma12244154
Received: 17 October 2019 / Revised: 2 December 2019 / Accepted: 5 December 2019 / Published: 11 December 2019
(This article belongs to the Special Issue Advances in Magnetic Measurements)
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. View Full-Text
Keywords: scanning magnetic microscopy; magnetic measurements; geological sample; equivalent-layer technique scanning magnetic microscopy; magnetic measurements; geological sample; equivalent-layer technique
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MDPI and ACS Style

Araujo, J.F.D.F.; Reis, A.L.A.; Correa, A.A.P.; Yokoyama, E.; Oliveira, V.C., Jr.; Mendoza, L.A.F.; Pacheco, M.A.C.; Luz-Lima, C.; Santos, A.F.; Osorio G., F.G.; Brito, G.E.; Araujo, W.W.R.; Tahir; Bruno, A.C.; Del Rosso, T. Scanning Magnetic Microscope Using a Gradiometric Configuration for Characterization of Rock Samples. Materials 2019, 12, 4154.

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