Viscosity dependent amplitude and phase of harmonic signals of magnetic nanoparticles

Ahmed Lotfy Elrefai Mohamed Mohamed Farag, Takashi Yoshida, Keiji Enpuku

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)


We studied effect of viscosity on harmonic signals of magnetic nanoparticles (MNP). Harmonic signals are measured when an excitation field with amplitude (~3 mT) and frequency (~10 kHz) is applied, where the relaxation mechanism of the used MNP is affected by the coexistence of Brownian and Néel processes. Viscosity dependence of amplitude and phase of fundamental, third and fifth harmonics are measured when viscosity changed from 0.89 mPa·s to 12.6 mPa·s. The measured viscosity dependences are discussed in terms of field dependent relaxation time of MNP. We also discuss a method to determine temperature and viscosity from the measured harmonic signals.

Original languageEnglish
Article number166809
JournalJournal of Magnetism and Magnetic Materials
Publication statusPublished - Aug 1 2020

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics


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