Anomalous time-induced curvature in Henkel plots based on the Preisach model

P. D. Mitchler, E. Dan Dahlberg, E. Wesseling, R. M. Roshko

Research output: Contribution to journalArticlepeer-review

2 Scopus citations


We have used a finite-temperature version of the Preisach model, in which thermally activated switching events supplement those induced by an applied field ha, to calculate the magnetizing and demagnetizing remanences, ir(ha) and id(-ha), respectively, assuming a Preisach distribution that is Gaussian in both the coercive field hc and the shift field hs. Since T≠0, the time t that the magnetization is permitted to relax influences the shape of the hysteresis loop and the Henkel plots constructed from the remanences. If the effective time for relaxation is specific to a given branch of the cycle, due perhaps to the way the system reacts to a given experimental procedure, it is possible to generate Henkel plots with curvature suggestive of mean field interaction effects, even if no such effects are actually present, or with such extreme demagnetizing-like curvature that the plot actually crosses the nominal lower boundary id= -ir. Experimental instances of this behavior are discussed.

Original languageEnglish (US)
Pages (from-to)5758-5760
Number of pages3
JournalJournal of Applied Physics
Issue number8 PART 2B
StatePublished - Apr 15 1996


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