Re-examination of the Steinmetz law for unsymmetrical magnetic hysteresis loops

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Published
2013-03
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  • https://www.elsevier.com/tdm/userlicense/1.0/
DOI
  • 10.1016/j.jmmm.2012.10.031
Publisher
Elsevier BV

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Abstract We have re-examined the Steinmetz law for unsymmetrical flux-density( B )–field( H ) loops in an arbitrary magnetized state for cold rolled steels from the viewpoint of magnetization mechanism. Under the criterion of B – H loops with | B | ∼ 1.1 T, a relation between the hysteresis loss and flux density change was found to fall almost the same curve as that for symmetrical loops obtained conventionally. In the intermediate B regime, the relation follows the usual Steinmetz law with a power-law exponent of 1.6, whose coefficient increases with defect density. These observations demonstrate that the hysteresis loss is only the function of the flux density change and the Steinmetz law always holds true in an arbitrary magnetized state if the pinning mechanism of irreversible Bloch wall motion prevails.

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