Pinning of a Bloch wall by diffusion of carbon atoms in a silicon-iron single crystal: an experimental study by means of an autoregressive spectrum analysis method

Nadine Martin (1) , François Glangeaud (1) , D. Guillet (2) , Jean-Louis Porteseil (2)

1 CEPHAG - Centre d'Études des Phénomènes Aléatoires et Géophysiques
2 LLN - Laboratoire Louis Néel

Diffusion of interstitial carbon atoms in iron creates the phenomenon of the ‘diffusion after-effect'. After a review of the main features of this effect, this paper reports on an experimental study of this phenomenon in a SiFe crystal. The various waveshapes generated by the motion of a single Bloch wall are analysed by an autoregressive signal processing technique which allows the study of the ‘instantaneous' power spectrum. A simple model is proposed in order to account for the experimental results

Mots clés: Magnetic materials; Bloch wall; Signal processing; Autoregressive model; instantaneous power spectrum; time-frequency

Domaines: Traitement du signal et de l'image [eess.SP]; Traitement du signal et de l'image [eess.SP]

Nadine Martin, François Glangeaud, D. Guillet, Jean-Louis Porteseil. Pinning of a Bloch wall by diffusion of carbon atoms in a silicon-iron single crystal: an experimental study by means of an autoregressive spectrum analysis method. J. Phys. C : Solid State Phys, 1986, 19, pp.407-418. ⟨10.1088/0022-3719/19/3/013⟩. ⟨hal-00370058⟩