Demagnetizing Factors for Nonuniform Nonlinear Cylinders and Rectangular Prisms

• Published in: IEEE transactions on magnetics Vol. 44; no. 11; pp. 3225 - 3228
• Main Authors: Farahani, A.V., Konrad, A.
• Format: Journal Article Conference Proceeding
• Language: English
• Published: New York, NY IEEE 01-11-2008; Institute of Electrical and Electronics Engineers; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Cross-disciplinary physics: materials science; rheology; Demagnetization; Demagnetizing; Density; Engine cylinders; Equations; Exact sciences and technology; Fluxmetric demagnetizing factor; Geometry; Magnetic fields; Magnetic flux; Magnetic materials; Magnetic permeability; Magnetic susceptibility; Magnetism; Magnetization; magnetization distribution; magnetometric demagnetizing factor; Magnetostatics; Materials science; Nonlinearity; Nonuniform; Other topics in materials science; Physics; Prisms; magnetometric demagnetizing factor; Fluxmetric demagnetizing factor; Magnetization; magnetization distribution; Magnetic properties
• ISSN: 0018-9464; 1941-0069
• DOI: 10.1109/TMAG.2008.2001663

Current methods to obtain fluxmetric and magnetometric demagnetizing factors assume a uniform susceptibility and solve initially the surface magnetic pole density. In this paper, a different approach is applied. This approach considers susceptibility as a function of position and finds the field distributions directly. It is proved that the magnetization distribution and the corresponding magnetic field minimize the magnetostatic energy and thus are the unique solution to the given magnetostatic problem. To verify the method, both rectangular and cylindrical magnetic media with nonlinear magnetization curves or a step change in susceptibility are considered.