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

Mohd Mawardi Saari, Nazatul Sharreena Suhaimi, Nurul Akmal Che Lah, Kenji Sakai, Toshihiko Kiwa, Keiji Tsukada

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

In order to tailor the magnetic nanoparticles (MNPs) properties for intended applications, it is crucial to unravelling their fundamental 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 reduce the impedance of the circuit efficiently. 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 distribution of multi-core iron oxide nanoparticles suspended in solutions with the iron concentration down to 300 ng/ml. We experimentally show that the first harmonic component is not entirely '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 immobilized states from 3 Hz to 18 kHz. A highly sensitive exploration of MNPs' dynamics can be expected using the developed AC magnetometer.

Original languageEnglish
Title of host publication2018 IEEE International Magnetic Conference, INTERMAG 2018
PublisherInstitute of Electrical and Electronics Engineers Inc.
ISBN (Electronic)9781538664254
DOIs
Publication statusPublished - Oct 24 2018
Event2018 IEEE International Magnetic Conference, INTERMAG 2018 - Singapore, Singapore
Duration: Apr 23 2018Apr 27 2018

Publication series

Name2018 IEEE International Magnetic Conference, INTERMAG 2018

Other

Other2018 IEEE International Magnetic Conference, INTERMAG 2018
CountrySingapore
CitySingapore
Period4/23/184/27/18

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Keywords

  • AC susceptibility
  • Harmonics
  • Magnetic nanoparticles
  • Magnetometer

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Instrumentation

Cite this

Saari, M. M., Suhaimi, N. S., Lah, N. A. C., Sakai, K., Kiwa, T., & Tsukada, K. (2018). A sensitive AC magnetometer using a resonant excitation coil for magnetic fluid characterization in nonlinear magnetization region. In 2018 IEEE International Magnetic Conference, INTERMAG 2018 [8508784] (2018 IEEE International Magnetic Conference, INTERMAG 2018). Institute of Electrical and Electronics Engineers Inc.. https://doi.org/10.1109/INTMAG.2018.8508784