Quelques aspects statistiques des processus d'aimantation dans les corps ferromagnétiques. Cas du déplacement d'une seule paroi de Bloch à 180° dans un milieu monocristallin aléatoirement perturbé

Vergne, Romain; Cotillard, J.C.; Porteseil, J.L.

doi:10.1051/rphysap:01981001609044900

Cited by 53 publications

(33 citation statements)

References 24 publications

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“…Answering this question would show the direction in which one should generalize the Preisach model in order to approach a universal description of hysteresis and would give a natural way to introduce new classes of hysteresis models. 7 pertaining to a closed loop. Therefore, the Preisach distribution obtained in that case is incorrect.…”

Section: Discussionmentioning

confidence: 99%

“…Pinning fields with Wiener-Lévy statistics are of definite physical interest. They were experimentally observed in ferromagnetic single crystals [6,7], and their introduction leads to a satisfactory general interpretation of the Barkhausen effect [8].…”

Section: Wiener-lévy Statisticsmentioning

confidence: 99%

“…(6), or, equivalently, from standard Preisach integrals based on Eq. (7). The analytical derivation was tested by generating the same loops also through computer simulations.…”

Section: Wiener-lévy Statisticsmentioning

confidence: 99%

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Stochastic dynamics in quenched-in disorder and hysteresis

Bertotti

Basso

Magni

1999

Journal of Applied Physics

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The conditions under which relaxation dynamics in the presence of quenched-in disorder lead to rate-independent hysteresis are discussed. The calculation of average hysteresis branches is reduced to the solution of the level-crossing problem for the stochastic field describing quenched-in disorder. Closed analytical solutions are derived for the case where the disorder is characterized by Wiener-Lévy statistics. This case is shown to be equivalent to the Preisach model and the associated Preisach distribution is explicitly derived, as a function of the parameters describing the original dynamic problem.

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Section: Discussionmentioning

confidence: 99%

Section: Wiener-lévy Statisticsmentioning

confidence: 99%

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Stochastic dynamics in quenched-in disorder and hysteresis

Bertotti

Basso

Magni

1999

Journal of Applied Physics

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“…2 This abrupt and stochastic response of the magnetization to a continuously varying external field has been related to the disorder existing in the system. 3,4 Actually, domain walls are pinned by impurities and therefore a magnetization change can only occur if the corresponding energetic barriers are overcome ͑depinning͒. Since these barriers are large, thermal activation is not effective, and the evolution of the sytem can only proceed by modifying the external field ͑athermal behavior͒.…”

Section: Introductionmentioning

confidence: 99%

Magnetic hysteresis in the Cu-Al-Mn intermetallic alloy: Experiments and modeling

1999

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We study isothermal magnetization processes in the Cu-Al-Mn intermetallic alloy. Hysteresis is observed at temperatures below the spin-freezing of the system. The characteristics of the hysteresis cycles as a function of temperature and Mn content ͑magnetic element͒ are obtained. At low temperature (Շ5 K͒ a change from smooth to sharp cycles is observed with increasing Mn content, which is related to the decrease of configurational disorder. We also study a zero-temperature site-diluted Ising model, suitable for the description of this Cu-Al-Mn system. The model reproduces the main features of the hysteresis loops observed experimentally. It exhibits a disorder-induced critical line separating a disordered phase from an incipient ferromagnetic ground state. The comparison between the model and the experiments allows us to conclude that the observed change in the experimental hysteresis loops can be understood within the framework of the theory of disorder-induced criticality in fluctuationless first-order phase transitions. ͓S0163-1829͑99͒13821-9͔

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“…This can be done if we know the equation governing the DW dynamics. The simplest assumption, supported by many experiments on various materials 10,11 is that the DW motion has a viscous character, and thus obeys an equation of the form This means, that the DW cannot store energy during its motion, and consequently that the wall-pinning field H p (x DW ) fluctuates around zero.…”

Section: A General Considerationsmentioning

confidence: 99%