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An AC magnetometer using automatic frequency switching of a resonant excitation coil for magnetic nanoparticles characterization

Mohd Mawardi, Saari and Mohd Aufa, Hadi Putera Zaini and Hamzah, Ahmad and Nurul Akmal, Che Lah (2018) An AC magnetometer using automatic frequency switching of a resonant excitation coil for magnetic nanoparticles characterization. In: 9th IEEE Control And System Graduate Research Colloquium (ICSGRC 2018), 3 - 4 Aug 2018 , Shah Alam, Selangor. pp. 1-4.. (Unpublished)

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Abstract

An AC magnetometer using a resonant excitation coil is presented for magnetic nanoparticles characterization. An automatic resonant frequency switching of the excitation coil circuit is developed to reduce the measurement time and human contributed errors. A network capacitor consists of 13 different capacitance values is fabricated and controlled by using a relay module and a microcontroller. The resonant circuit of the excitation coil is resonated up to 81.36 kHz to reduce its impedance observed by a current amplifier. The impedance of the resonant excitation coil is evaluated to access the effectiveness of the resonant technique. A first-order differential coil is used to sense the magnetization from a sample and its sensitivity with respect to magnetic moment and frequency is measured. Using the developed system, we measure the complex magnetization of a multi-core iron oxide nanoparticles solution and estimated its hydrodynamic size.

Item Type: Conference or Workshop Item (Lecture)
Uncontrolled Keywords: AC susceptibility; Magnetometer; Magnetic nanoparticles; Coil
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: 10 Dec 2018 04:24
Last Modified: 10 Dec 2018 04:24
URI: http://umpir.ump.edu.my/id/eprint/22258
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