Título: | ADAPTABLE SCANNING MAGNETIC MICROSCOPE FOR MEASUREMENT OF REMANENT FIELDS | ||||||||||||
Autor: |
JOAO FELIPE CHAVES E SILVA |
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Colaborador(es): |
JEFFERSON FERRAZ DAMASCENO FELIX ARAUJO - Orientador |
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Catalogação: | 13/JUN/2023 | Língua(s): | PORTUGUESE - BRAZIL |
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Tipo: | TEXT | Subtipo: | THESIS | ||||||||||
Notas: |
[pt] Todos os dados constantes dos documentos são de inteira responsabilidade de seus autores. Os dados utilizados nas descrições dos documentos estão em conformidade com os sistemas da administração da PUC-Rio. [en] All data contained in the documents are the sole responsibility of the authors. The data used in the descriptions of the documents are in conformity with the systems of the administration of PUC-Rio. |
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Referência(s): |
[pt] https://www.maxwell.vrac.puc-rio.br/projetosEspeciais/ETDs/consultas/conteudo.php?strSecao=resultado&nrSeq=62851&idi=1 [en] https://www.maxwell.vrac.puc-rio.br/projetosEspeciais/ETDs/consultas/conteudo.php?strSecao=resultado&nrSeq=62851&idi=2 |
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DOI: | https://doi.org/10.17771/PUCRio.acad.62851 | ||||||||||||
Resumo: | |||||||||||||
Magnetic Scanning Microscopy (MMV) was developed to visualize magnetic fields of a sample or material via scanning, making it particularly useful for
geology, biomedicine, material characterization, and the steel industry. To this
end, an MMV was assembled using a micro-metal magnetic shielding structure to
analyze remanent fields. The sensors sensitive area was evaluated, and the HQ-0811 (AKM - Asahi Kasei Microdevices) and STJ-010 (Micro Magnetics) sensors
were chosen, with the HQ-0811 standardized on PCBs (Printed Circuit Board)
for easy handling and to enhance the system s robustness. Two piezoelectric
step motors, ANC-150 (Attocube Systems), were placed in a planar arrangement
in the shielded chamber to enable the analyzed samples movement under the
mounted sensor. The Keithley Delta-Mode system was used in conjunction with
the Precision Current Source Model 6220 and Nanovoltimeter Model 2182A
(both Keithley) to acquire sensor data. Three distinct samples were analyzed for
calibration, and a MATLAB program was created to extract the magnetization
of the analyzed material from the images obtained. Additionally, the system s
capabilities were demonstrated by mapping a rock sample from the Parnaíba
Basin.
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