Tsukada, Keiji and Koji, Morita and Matsunaga, Yasuaki and Mohd Mawardi, Saari and Sakai, Kenji and Kiwa, Toshihiko (2016) Hybrid type HTS-SQUID magnetometer with vibrating and rotating sample. IEEE Transactions on Applied Superconductivity, 26 (3). pp. 1-5. ISSN 1051-8223 (Print); 1558-2515 (Online). (Published)
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Abstract
Highly sensitive measurement of the very weak magnetic characteristics of magnetic particles in solution or of a solution itself is required for applications, such as biomedical examinations. In this paper, higher sensitivity and additional performance with relaxation measurement and harmonic signal detection were achieved by an improvement of the driving mechanism and the high-resolution electric magnet, and optimization of the superconducting quantum interference device (SQUID) detection unit. A servomotor was used for sample vibration and rotation with precise control and high speed. For detection of the M-H characteristics, the sample was vibrated under the magnetic field in the electromagnet. For measuring the relaxation of the magnetization, the sample was rotated. A first-order differential pickup coil with a normal conducting wire connected to the input coil of a high-temperature superconductor-SQUID was used to detect the magnetic signal from the sample. High-resolution measurement of the magnetic moment on the order of 10-11 A m2 was achieved with this system configuration. An ac magnetic field with a dc bias could then be applied to the sample for detection of the harmonic signal. The magnetic relaxation signal from the sample was measured by another of the same type of differential detection coil equipped outside of the electric magnet by rotating, instead of vibrating, the sample. The magnetization curve for a low concentration of iron nanoparticles with a superparamagnetic character in the solution was successfully measured using the developed magnetometer, and the relaxation phenomenon was also characterized.
| Item Type: | Article |
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| Additional Information: | Indexed by Scopus |
| Uncontrolled Keywords: | Superconducting magnets; Magnetometers; Magnetic field measurement; Magnetic fields; Magnetic resonance imaging; Biomedical measurement; SQUIDs |
| Subjects: | Q Science > QC Physics T Technology > TK Electrical engineering. Electronics Nuclear engineering |
| Faculty/Division: | Faculty of Electrical & Electronic Engineering |
| Depositing User: | Mrs Norsaini Abdul Samat |
| Date Deposited: | 24 Dec 2019 02:31 |
| Last Modified: | 24 Dec 2019 02:31 |
| URI: | http://umpir.ump.edu.my/id/eprint/25433 |
| Download Statistic: | View Download Statistics |
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