DEMAGNETIZED-STATE DEPENDENCE OF HENKEL PLOTS .2. DOMAIN-WALL MOTION

The interpretation of various magnetization curves through Henkel plots and DELTAm plots as become popular in recent years for characterization of interactions in hysteresis. To investigate this approach, we have calculated Henkel plots using a hysteresis model based on independently moving domain walls. A variety of demagnetized states produced by ac, dc+, and dc-demagnetization methods as well as microscopically and randomly demagnetized states are used to calculate m(r)(H). The resulting collection of Henkel plots contains examples of both ''positive'' and ''negative'' deviations from the Wohlfarth relation which depend on the demagnetization method. Also, the Henkel plot calculated for the ac demagnetized state deviates from the square-root law previously calculated for domain wall pinning using a classical Preisach model.