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Dynamics of magnetic nano-flake vortices in Newtonian fluids

Bazazzadeh, N ; Sharif University of Technology

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  1. Type of Document: Article
  2. DOI: 10.1016/j.jmmm.2016.06.066
  3. Publisher: Elsevier
  4. Abstract:
  5. We study the rotational motion of nano-flake ferromagnetic disks suspended in a Newtonian fluid, as a potential material owing the vortex-like magnetic configuration. Using analytical expressions for hydrodynamic, magnetic and Brownian torques, the stochastic angular momentum equation is determined in the dilute limit conditions under applied magnetic field. Results are compared against experimental ones and excellent agreement is observed. We also estimate the uncertainty in the orientation of the disks due to the Brownian torque when an external magnetic field aligns them. Interestingly, this uncertainty is roughly proportional to the ratio of thermal energy of fluid to the magnetic energy stored in the disks. Our approach can be implemented in many practical applications including biotechnology and multi-functional fluidics
  6. Keywords:
  7. Brownian dynamics simulation ; Magnetic vortex ; Brownian movement ; Fluidics ; Magnetic fields ; Newtonian liquids ; Stochastic systems ; Uncertainty analysis ; Vortex flow ; Analytical expressions ; Applied magnetic fields ; External magnetic field ; Magnetic configuration ; Magnetic vortices ; Nano-bio-magnetics ; Magnetism
  8. Source: Journal of Magnetism and Magnetic Materials ; Volume 419 , 2016 , Pages 547-552 ; 03048853 (ISSN)
  9. URL: http://www.sciencedirect.com/science/article/pii/S0304885316312094