An AC magnetometer using automatic frequency switching of a resonant excitation coil for magnetic nanoparticles characterization
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 differen...
| Main Authors: | , , , |
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| Format: | Conference or Workshop Item |
| Language: | English English |
| Published: |
2018
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| Subjects: | |
| Online Access: | http://umpir.ump.edu.my/id/eprint/22258/ http://umpir.ump.edu.my/id/eprint/22258/1/6.%20An%20AC%20magnetometer%20using%20automatic%20frequency%20switching%20of%20a%20resonant.pdf http://umpir.ump.edu.my/id/eprint/22258/2/6.1%20An%20AC%20magnetometer%20using%20automatic%20frequency%20switching%20of%20a%20resonant.pdf |
| Summary: | 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. |
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