Empirical expression for AC magnetization harmonics of magnetic nanoparticles under high-frequency excitation field for thermometry

Zhongzhou Du, Dandan Wang, Yi Sun, Yuki Noguchi, Shi Bai, Takashi Yoshida

Research output: Contribution to journalArticlepeer-review

Abstract

The Fokker–Planck equation accurately describes AC magnetization dynamics of magnetic nanoparticles (MNPs). However, the model for describing AC magnetization dynamics of MNPs based on Fokker-Planck equation is very complicated and the numerical calculation of Fokker-Planck function is time consuming. In the stable stage of AC magnetization response, there are differences in the harmonic phase and amplitude between the stable magnetization response of MNPs described by Langevin and Fokker–Planck equation. Therefore, we proposed an empirical model for AC magnetization harmonics to compensate the attenuation of harmonics amplitude induced by a high frequency excitation field. Simulation and experimental results show that the proposed model accurately describes the AC M–H curve. Moreover, we propose a harmonic amplitude–temperature model of a magnetic nanoparticle thermometer (MNPT) in a high-frequency excitation field. The simulation results show that the temperature error is less than 0.008 K in the temperature range 310–320 K. The proposed empirical model is expected to help improve MNPT performance.

Original languageEnglish
Article number2506
Pages (from-to)1-11
Number of pages11
JournalNanomaterials
Volume10
Issue number12
DOIs
Publication statusPublished - Dec 2020

All Science Journal Classification (ASJC) codes

  • Chemical Engineering(all)
  • Materials Science(all)

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