Table of Contents
Journal of Metallurgy
Volume 2012, Article ID 752871, 5 pages
http://dx.doi.org/10.1155/2012/752871
Research Article

Internal Demagnetizing Factor in Ferrous Metals

1Department of Engineering Science, University of Oxford, Parks Road, Oxford OX1 3PJ, UK
2Department of Materials, Physics of Eotvos Lorand University, P.O. Box 32, Budapest 1518, Hungary
3Research Institute for Solid State Physics and Optics, P.O. Box 49, Budapest 1525, Hungary

Received 26 July 2012; Accepted 19 September 2012

Academic Editor: Chih-Ming Chen

Copyright © 2012 Jenő Takács et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Modelling the saturation major loop of a ferrous metal produces the intrinsic magnetization parameters; fitting the measured commutation curve, however, can yield different results. The relation of the intrinsic loci of the vertices of the minor loops () to the experimental curve () is investigated. The two-way transformation between the two curves is formulated in closed mathematical form with the help of the internal demagnetization factor, . The method is applied to four ferrous metals, with widely different intrinsic properties (soft nonoriented Fe-Si steel, normalized low carbon steel, and Finemet in nanocrystalline and amorphous state) supporting the predictions of the proposal. The developed relationship is model independent and it is shown that the factor depends linearly on coercivity based on experimental evidence.