Development of a highly sensitive ACDC magnetometer utilizing high-Tc squid for characterization of magnetic mixture materials

Magnetometers have become considerably important nowadays in many fields owing to promising potentials of non-invasive magnetic technique. A magnetometer that possesses high sensitivity, compact and low-running cost is rather desired so that it is versatile compared to conventional magnetometers and...

Full description

Saved in:

Bibliographic Details
Main Author:	Mohd Mawardi, Saari
Format:	Thesis
Language:	English
Published:	2015
Subjects:	QC Physics
Online Access:	http://umpir.ump.edu.my/id/eprint/16929/19/Development%20of%20a%20highly%20sensitive%20ACDC%20magnetometer%20utilizing%20high-Tc%20squid%20for%20characterization%20of%20magnetic%20mixture%20materials.pdf
Tags:	Add Tag No Tags, Be the first to tag this record!

id	my-ump-ir.16929
record_format	uketd_dc
spelling	my-ump-ir.169292021-11-29T01:22:47Z Development of a highly sensitive ACDC magnetometer utilizing high-Tc squid for characterization of magnetic mixture materials 2015-09 Mohd Mawardi, Saari QC Physics Magnetometers have become considerably important nowadays in many fields owing to promising potentials of non-invasive magnetic technique. A magnetometer that possesses high sensitivity, compact and low-running cost is rather desired so that it is versatile compared to conventional magnetometers and applicable in many areas. This thesis reports developmentof an AC/DC magnetometer using a high-Ta SQUID (high critical temperature superconducting quantum interference devices) with a flux transformer. The critical feature of the system r is the use of a high-Ta SQUID and a normal conductive detection coil, which enables the realization of a compact, highly sensitive and low-running-cost system. Optimizations and improvements performed during this work to increase the performance of the developed system are presented. Implementation of a feedback system of dual excitation coil enabled a wide range of excitation magnetic field to be achieved with high resolution. Optimizations on the shape of detection coil and sample increased the sensitivity in DC susceptibility measurement. The proposed harmonic detection technique for DC susceptibility measurement was effective in improving the signal-to-noise ratio. A compensation coil technique was implemented during fabrication of detection coil for AC susceptibi1ft measurement to archive effective reduction in interference signal from excitation magnetic field and compact integration of AC/DC detection coil. This thesis culminates with two demonstrations of the developed system in a non-destructive evaluation of moisture content in mortar and a characterization of magnetic moment distribution in low-concentration solutions of magnetic nanoparticles for bio-medical applications. The separation of magnetic properties in mixture materials was successfully achieved with high sensitivity in both applications. The developed system can be expected as a powerful instrument for explorations of magnetic properties and non-destructive tests in future. 2015-09 Thesis http://umpir.ump.edu.my/id/eprint/16929/ http://umpir.ump.edu.my/id/eprint/16929/19/Development%20of%20a%20highly%20sensitive%20ACDC%20magnetometer%20utilizing%20high-Tc%20squid%20for%20characterization%20of%20magnetic%20mixture%20materials.pdf pdf en public http://iportal.ump.edu.my/lib/item?id=chamo:98301&theme=UMP2 phd doctoral Universiti Malaysia Pahang Faculty of Industrial Sciences and Technology
institution	Universiti Malaysia Pahang Al-Sultan Abdullah
collection	UMPSA Institutional Repository
language	English
topic	QC Physics
spellingShingle	QC Physics Mohd Mawardi, Saari Development of a highly sensitive ACDC magnetometer utilizing high-Tc squid for characterization of magnetic mixture materials
description	Magnetometers have become considerably important nowadays in many fields owing to promising potentials of non-invasive magnetic technique. A magnetometer that possesses high sensitivity, compact and low-running cost is rather desired so that it is versatile compared to conventional magnetometers and applicable in many areas. This thesis reports developmentof an AC/DC magnetometer using a high-Ta SQUID (high critical temperature superconducting quantum interference devices) with a flux transformer. The critical feature of the system r is the use of a high-Ta SQUID and a normal conductive detection coil, which enables the realization of a compact, highly sensitive and low-running-cost system. Optimizations and improvements performed during this work to increase the performance of the developed system are presented. Implementation of a feedback system of dual excitation coil enabled a wide range of excitation magnetic field to be achieved with high resolution. Optimizations on the shape of detection coil and sample increased the sensitivity in DC susceptibility measurement. The proposed harmonic detection technique for DC susceptibility measurement was effective in improving the signal-to-noise ratio. A compensation coil technique was implemented during fabrication of detection coil for AC susceptibi1ft measurement to archive effective reduction in interference signal from excitation magnetic field and compact integration of AC/DC detection coil. This thesis culminates with two demonstrations of the developed system in a non-destructive evaluation of moisture content in mortar and a characterization of magnetic moment distribution in low-concentration solutions of magnetic nanoparticles for bio-medical applications. The separation of magnetic properties in mixture materials was successfully achieved with high sensitivity in both applications. The developed system can be expected as a powerful instrument for explorations of magnetic properties and non-destructive tests in future.
format	Thesis
qualification_name	Doctor of Philosophy (PhD.)
qualification_level	Doctorate
author	Mohd Mawardi, Saari
author_facet	Mohd Mawardi, Saari
author_sort	Mohd Mawardi, Saari
title	Development of a highly sensitive ACDC magnetometer utilizing high-Tc squid for characterization of magnetic mixture materials
title_short	Development of a highly sensitive ACDC magnetometer utilizing high-Tc squid for characterization of magnetic mixture materials
title_full	Development of a highly sensitive ACDC magnetometer utilizing high-Tc squid for characterization of magnetic mixture materials
title_fullStr	Development of a highly sensitive ACDC magnetometer utilizing high-Tc squid for characterization of magnetic mixture materials
title_full_unstemmed	Development of a highly sensitive ACDC magnetometer utilizing high-Tc squid for characterization of magnetic mixture materials
title_sort	development of a highly sensitive acdc magnetometer utilizing high-tc squid for characterization of magnetic mixture materials
granting_institution	Universiti Malaysia Pahang
granting_department	Faculty of Industrial Sciences and Technology
publishDate	2015
url	http://umpir.ump.edu.my/id/eprint/16929/19/Development%20of%20a%20highly%20sensitive%20ACDC%20magnetometer%20utilizing%20high-Tc%20squid%20for%20characterization%20of%20magnetic%20mixture%20materials.pdf
_version_	1783732016491003904

Development of a highly sensitive ACDC magnetometer utilizing high-Tc squid for characterization of magnetic mixture materials

Similar Items