Abstract
The Preisach model successfully describes cyclic hysteresis phenomena in a conceptually simple and mathematically elegant way. In this paper the model is extended to noncyclic magnetization processes like the first magnetization from the demagnetized state. Our experiments reveal that the Preisach function in the noncyclic case is different from that of the cyclic case, a hitherto unknown phenomenon. The change is demonstrated by a comparison of the Preisach functions of the cyclic and noncyclic case and discussed considering the real magnetic structure in the specimen. Secondly, the noncyclic case turns out to be very sensitive to mechanical stresses. It is shown that after a special ac-demagnetization with a small number of cycles the initial curve reveals mechanical influences which cannot be seen in the cyclic case.
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