Journal of Magnetics

The Korean Magnetics Society (한국자기학회)
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Shape Dependent Coercivity Simulation of a Spherical Barium Ferrite (S-BaFe) Particle with Uniaxial Anisotropy

  • Abo, Gavin S. (Department of Electrical and Computer Engineering and MINT Center, The University of Alabama) ;
  • Hong, Yang-Ki (Department of Electrical and Computer Engineering and MINT Center, The University of Alabama) ;
  • Jalli, Jeevan (Department of Electrical and Computer Engineering and MINT Center, The University of Alabama) ;
  • Lee, Jae-Jin (Department of Electrical and Computer Engineering and MINT Center, The University of Alabama) ;
  • Park, Ji-Hoon (Department of Electrical and Computer Engineering and MINT Center, The University of Alabama) ;
  • Bae, Seok (Department of Electrical and Computer Engineering and MINT Center, The University of Alabama) ;
  • Kim, Seong-Gon (Department of Physics and Astronomy, Mississippi State University) ;
  • Choi, Byoung-Chul (Department of Physics and Astronomy, University of Victoria, Victoria, British Columbia) ;
  • Tanaka, Terumitsu (Department of Information Science and Electrical Engineering, Kyushu University)
  • Received : 2011.07.09
  • Accepted : 2012.02.29
  • Published : 2012.03.31
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Abstract

The coercivity of a single 27 nm-spherical barium ferrite (S-BaFe) particle was simulated using three models: 1) Gibbs free energy (GFE), 2) Landau-Lifshitz-Gilbert (LLG), and 3) Stoner-Wohlfarth (S-W). Spherically and hexagonally shaped particles were used in the GFE and LLG simulations to investigate coercivity with the different shape anisotropies. The effect of shape was not included in the S-W model. It was found that the models using a spherical shape resulted in a coercivity higher than the models using the hexagonal shape with both shapes having the same diameter. The coercivity estimated with the S-W model was approximately the same as that for the spherical-shape models, which indicates that spherical shape has no significant effect on the particle's coercivity at nanoscale.

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References

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