Journal of Magnetics

The Korean Magnetics Society (한국자기학회)
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A Study on the Deperm Protocols Considering Demagnetizing Field of a Ferromagnetic Material

  • Ju, Hye Sun (Department of Electrical Engineering, Pusan National University) ;
  • Won, Hyuk (Korea Marine Equipment Research Institute) ;
  • Chung, Hyun Ju (The 6th R&D Institute-3, Agency for Defense Development) ;
  • Park, Gwan Soo (Department of Electrical Engineering, Pusan National University)
  • Received : 2013.09.23
  • Accepted : 2014.03.14
  • Published : 2014.03.31
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Abstract

Magnetic materials with large coercive force and high squareness ratio are currently developing to meet an industrial demand. Since a ferromagnetic material has hysteresis characteristics, it is hard to demagnetize a ferromagnetic material precisely. In this paper, we describe deperm processes and conduct an analysis of residual magnetization of ferromagnetic material using the Preisach modeling with a two-dimensional finite elements method (FEM). From the results, it was shown that an exponential decrement form of deperm protocol is more efficient than a linear decrement form because of the demagnetizing field in the ferromagnetic material.

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