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Topology Optimization of Perpendicular Magnetic Recording System by Considering Magnetic Nonlinearity

재료의 비선형을 고려한 수직기록장치의 위상최적화

  • Received : 2009.10.29
  • Accepted : 2010.05.09
  • Published : 2010.07.01

Abstract

This paper proposes a density method based topology optimization of a perpendicular magnetic recording system design in which the saturation effect is taken into account. During the topology optimization process in magnetic fields, the magnetic reluctivity is updated in accordance with the changes in element density determined by a sensitivity analysis. The magnetic reluctivity is determined from a B-H curve and is used to represent nonlinear material property, i.e., the saturation effect. The sensitivity for a generalized response functional is formulated using the adjoint variable method in which the nonlinear property is taken into account and the objective function is set such that the magnetic energy in the media is maximized. Effects due to the nonlinear property can be observed from a numerical study in which the linear and the nonlinear topology optimization results are compared.

Keywords

Topology Optimization;Sensitivity Analysis;Adjoint Variable Method;Magnetic Saturation Effect;Finite Element Method;Density Method

Acknowledgement

Supported by : 한국학술진흥재단

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