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Characterizing complex mineral structures in thin sections of geological samples with a scanning hall effect microscope
Pontifical Catholic University of Rio de Janeiro, Brazil.
Observatório Nacional, Brazil.
Observatório Nacional, Brazil.
University of California, US.
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2019 (English)In: Sensors, ISSN 1424-8220, E-ISSN 1424-8220, Vol. 19, no 7, article id 1636Article in journal (Refereed) Published
Abstract [en]

We improved a magnetic scanning microscope for measuring the magnetic properties of minerals in thin sections of geological samples at submillimeter scales. The microscope is comprised of a 200 µm diameter Hall sensor that is located at a distance of 142 µm from the sample; an electromagnet capable of applying up to 500 mT DC magnetic fields to the sample over a 40 mm diameter region; a second Hall sensor arranged in a gradiometric configuration to cancel the background signal applied by the electromagnet and reduce the overall noise in the system; a custom-designed electronics system to bias the sensors and allow adjustments to the background signal cancelation; and a scanning XY stage with micrometer resolution. Our system achieves a spatial resolution of 200 µm with a noise at 6.0 Hz of 300 nT rms /(Hz) 1/2 in an unshielded environment. The magnetic moment sensitivity is 1.3 × 10 −11 Am 2 . We successfully measured the representative magnetization of a geological sample using an alternative model that takes the sample geometry into account and identified different micrometric characteristics in the sample slice.

Place, publisher, year, edition, pages
MDPI AG , 2019. Vol. 19, no 7, article id 1636
Keywords [en]
Geological sample, Hall sensor, Magnetic materials, Magnetic scanning microscope, Electromagnets, Geology, Hall effect transducers, Magnetic moments, Scanning, Background signals, DC magnetic field, Electronics system, Geological samples, Spatial resolution, Unshielded environment, Microscopes
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:ri:diva-39518DOI: 10.3390/s19071636Scopus ID: 2-s2.0-85064564041OAI: oai:DiVA.org:ri-39518DiVA, id: diva2:1335979
Note

Funding details: Conselho Nacional de Desenvolvimento Científico e Tecnológico; Funding details: Fundação Carlos Chagas Filho de Amparo à Pesquisa do Estado do Rio de Janeiro; Funding details: Coordenação de Aperfeiçoamento de Pessoal de Nível Superior; Funding text 1: Funding: This study was funded in part by the following Brazilian agencies: The National Council for Scientific and Technological Development (Conselho Nacional de Desenvolvimento Científico e Tecnológico—CNPq), the Coordinating Agency for the Improvement of Higher Education (Coordenação de Aperfeicoamento de Pessoal de Nível Superior—Capes) and the Research Support Foundation of Rio de Janeiro (Fundação de Amparo à Pesquisa do Estado do Rio de Janeiro—FAPERJ).

Available from: 2019-07-08 Created: 2019-07-08 Last updated: 2019-07-08Bibliographically approved

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