Magnetic fluid dynamics in a rotating magnetic field

Takashi Yoshida, Keiji Enpuku, J. Dieckhoff, M. Schilling, F. Ludwig

Research output: Contribution to journalArticle

34 Citations (Scopus)

Abstract

The dynamics of a magnetic fluid in a rotating magnetic field in the presence of thermal noise were studied by performing numerical simulations based on the Fokker-Planck equation. We first clarified the dynamic properties by numerical simulation such as the frequency dependence of the fluid magnetization, the field-dependent relaxation time, and the M-H curve in a rotating magnetic field. Using the simulation results, we modified an existing analytical model and obtained an empirical expression to quantitatively describe the particle dynamics. The simulation results were compared with experimental results in a rotating magnetic field. The frequency dependence of the magnetization of the magnetic fluid was measured over the linear and nonlinear regions. In order to make a quantitative comparison, the hydrodynamic and effective core size distributions were independently estimated from measurements of the ac susceptibility and the M-H curve. The phase lag and amplitude in a rotating magnetic field obtained from our simulation agreed well with the experimental results.

Original languageEnglish
Article number053901
JournalJournal of Applied Physics
Volume111
Issue number5
DOIs
Publication statusPublished - Mar 1 2012

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fluid dynamics
magnetic fields
simulation
fluids
magnetization
thermal noise
curves
Fokker-Planck equation
dynamic characteristics
time lag
relaxation time
hydrodynamics
magnetic permeability

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

Cite this

Yoshida, T., Enpuku, K., Dieckhoff, J., Schilling, M., & Ludwig, F. (2012). Magnetic fluid dynamics in a rotating magnetic field. Journal of Applied Physics, 111(5), [053901]. https://doi.org/10.1063/1.3688254

Magnetic fluid dynamics in a rotating magnetic field. / Yoshida, Takashi; Enpuku, Keiji; Dieckhoff, J.; Schilling, M.; Ludwig, F.

In: Journal of Applied Physics, Vol. 111, No. 5, 053901, 01.03.2012.

Research output: Contribution to journalArticle

Yoshida, T, Enpuku, K, Dieckhoff, J, Schilling, M & Ludwig, F 2012, 'Magnetic fluid dynamics in a rotating magnetic field', Journal of Applied Physics, vol. 111, no. 5, 053901. https://doi.org/10.1063/1.3688254
Yoshida, Takashi ; Enpuku, Keiji ; Dieckhoff, J. ; Schilling, M. ; Ludwig, F. / Magnetic fluid dynamics in a rotating magnetic field. In: Journal of Applied Physics. 2012 ; Vol. 111, No. 5.
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