Modified Jiles-Atherton-Sablik model for asymmetry in magnetomechanical effect under tensile and compressive stress

A robust magnetomechanical effect model is desirable for the measurement of magnetic properties in the evaluation of stress in ferromagnetic materials. The previous classical Jiles-Atherton-Sablik model has some limitations in describing the asymmetry in magnetic behavior under tensile and compressive stress. In this paper, the Jiles-Atherton-Sablik model has been modified by the incorporation of a stress demagnetization term, a variable pinning coefficient, a stress-dependent domain coupling coefficient, and stress-dependent saturation magnetostriction. It is found that the modified model provides a much better description of asymmetrical magnetic properties under tension and compression. Moreover, the accuracy of the calculations was improved considerably, particularly in the compressive stress situation. (C) 2011 American Institute of Physics. [doi:10.1063/1.3638711]