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ETDs @PUC-Rio
Estatística
Título: ADAPTABLE SCANNING MAGNETIC MICROSCOPE FOR MEASUREMENT OF REMANENT FIELDS
Autor: JOAO FELIPE CHAVES E SILVA
Colaborador(es): JEFFERSON FERRAZ DAMASCENO FELIX ARAUJO - Orientador
Catalogação: 13/JUN/2023 Língua(s): PORTUGUESE - BRAZIL
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.
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
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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