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A sensitive ac magnetometer using a resonant excitation coil for characterization of magnetic fluid in nonlinear magnetization region

Mohd Mawardi, Saari and Nazatul Sharreena, Suhaimi and Nurul Akmal, Che Lah and Sakai, Kenji and Toshihiko, Kiwa (2018) A sensitive ac magnetometer using a resonant excitation coil for characterization of magnetic fluid in nonlinear magnetization region. In: IEEE International Magnetics Conference (INTERMAG 2018), 23-27 April 2018 , Marina Bay Sands, Singapore. p. 1.. (Unpublished)

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Abstract

In order to tailor magnetic nanoparticles (MNPs) for intended applications, it is important to unravel their dynamics with respect to excitation magnetic field. In this work, we report on the development of a sensitive AC magnetometer using a resonant excitation coil for this purpose. The excitation coil fabricated from a Litz wire is connected to a capacitor network to effectively reduce the impedance of the circuit. The high efficiency showed by the excitation coil enables investigation of MNP’s dynamics in the nonlinear magnetization region. We demonstrate the sensitivity of the developed system by measuring the harmonics of a multicore iron oxide nanoparticle solution down to 300 ng/ml of iron concentration. We experimentally show that the first harmonic component is not completely ‘transparent’ to the diamagnetic background of the carrier liquid compared to the higher harmonics. We also demonstrate the complex magnetization measurement of the iron oxide nanoparticles in solution and dry states from 3 Hz to 18 kHz. A highly sensitive exploration of MNPs’ dynamics can be expected using the developed AC magnetometer.

Item Type: Conference or Workshop Item (Lecture)
Uncontrolled Keywords: Magnetometer, AC susceptibility, harmonics, magnetic nanoparticles
Subjects: T Technology > TK Electrical engineering. Electronics Nuclear engineering
Faculty/Division: Faculty of Electrical & Electronic Engineering
Faculty of Manufacturing Engineering
Depositing User: Pn. Hazlinda Abd Rahman
Date Deposited: 08 Jun 2018 03:04
Last Modified: 08 Jun 2018 03:04
URI: http://umpir.ump.edu.my/id/eprint/21324
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