Effect of viscosity on harmonic signals from magnetic fluid

Takashi Yoshida, Shi Bai, Aiki Hirokawa, Kazuhiro Tanabe, Keiji Enpuku

研究成果: ジャーナルへの寄稿学術誌査読

42 被引用数 (Scopus)

抄録

We explored the effect of viscosity on harmonic signals from a magnetic fluid. Using a numerical simulation that accounts for both the Brownian and Néel processes, we clarified how the magnetization mechanism is affected by viscosity. When the excitation field varies much slower than the Brownian relaxation time, magnetization can be described by the Langevin function. On the other hand, for the case when the excitation field varies much faster than the Brownian relaxation time, but much slower than the Néel relaxation time, the easy axes of the magnetic nanoparticles (MNPs) turn to some extent toward the direction of the excitation field in an equilibrium state. This alignment of the easy axes of MNPs caused by the AC field becomes more significant with the increase of the AC field strength. Consequently, the magnetization is different from the Langevin function even though Néel relaxation time is faster than time period of the external frequency. It is necessary to consider these results when we use harmonic signals from a magnetic fluid in a high-viscosity medium.

本文言語英語
ページ(範囲)105-110
ページ数6
ジャーナルJournal of Magnetism and Magnetic Materials
380
DOI
出版ステータス出版済み - 4月 15 2015

!!!All Science Journal Classification (ASJC) codes

  • 電子材料、光学材料、および磁性材料
  • 凝縮系物理学

フィンガープリント

「Effect of viscosity on harmonic signals from magnetic fluid」の研究トピックを掘り下げます。これらがまとまってユニークなフィンガープリントを構成します。

引用スタイル