Magnetoelasticity for large stresses

Abstract

Recent interest in the theory and modeling of magnetoelastic processes has drawn upon the Preisach model of hysteresis and the anhysteretic model. We have extended our past work with the differential susceptibility model to stresses much larger than residual stress, reaching the local anhysteretic curve and the Villari reversal. Progress in this nonlinear differential magnetoelastic theory arises from the concept of local demagnetization, that is positive and negative stress-sensitive domain walls and stress-insensitive walls are attributed average local magnetization, M <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">i</sub> , rather than global magnetization, an experimentally determined nonlinear demagnetization factor, D <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">o</sub> , that replaces a function by Spano, and an improved approach to modeling hysteresis.