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Etude de la dynamique d'une paroi de domain magnétique dans des pistes submicroniques

Abstract : This work is devoted to the experimental study of the origin of Anomalous Hall Effect (AHE) and the dynamics of a domain wall (DW). For that, I have developed a low noise dynamical measurement technique using the Anomalous Hall Effect (AHE) that allows to detect in real time the domain wall propagation in submicron wires. The first part is devoted to the experimental study of the origin of Anomalous Hall Effect (AHE) in ultrathin Pt/Co/Pt/Al2O3 films with perpendicular magnetic anisotropy. By modifying the interfaces with ions irradiation, it is shown that the diffusion both at the surface and at the interfaces are the main mechanisms contributing to the AHE. In parallel, I have used the AHE to study the dynamics of a domain wall (DW) in submicron wires patterned on the Pt/Co/Pt/Al2O3 films with wire width w0. The DW velocity v(H) is hugely reduced when w0 is decreased and its field dependence is consistent with a creep process. The effective critical field scales as 1/w0. Measurement of v(H) in wires with controlled artificial defects shows that this effect arises from the edge roughness introduced during by patternig. A creep model is developed and it agrees with the experimental results. Finally, it has been shown that the DW propagation dynamics strongly depend on the irradiation dose.
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https://tel.archives-ouvertes.fr/tel-00006039
Contributor : Fenglei Cayssol <>
Submitted on : Friday, May 7, 2004 - 4:14:19 PM
Last modification on : Wednesday, September 16, 2020 - 4:53:44 PM
Long-term archiving on: : Friday, April 2, 2010 - 7:58:10 PM

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Fenglei Cayssol. Etude de la dynamique d'une paroi de domain magnétique dans des pistes submicroniques. Matière Condensée [cond-mat]. Université Paris-Diderot - Paris VII, 2003. Français. ⟨tel-00006039⟩

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