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Electrodéposition sous champ magnétique de zinc et de fer.Propriétés magnétiques des arborescences de fer

Abstract : This work is concerned with the effects of magnetic fields on arborescence of zinc and iron obtained by electrochemical deposition in thin cell and with the magnetic properties of iron arborescences. For zinc under normal magnetic field, the macroscopic morphology changes are explained by the mechanical action, on the growing aggregate, of fluid convection induced by the Lorentz force. A weak effect is observed at the microscopic scale but none on the crystal structure. An in-plane magnetic field influences the growth only very weakly. For iron, a normal magnetic field has a weak effect. An in-plane magnetic field transforms a morphology with circular symmetry to a morphology with two perpendicular axes of symmetry, one parallel to the field. This is explained by the minimisation of the Zeeman and magnetic dipolar energy. It is shown that magnetic properties are very sensitive to the morphology. Unusual anisotropy and coercivity are observed.
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https://tel.archives-ouvertes.fr/tel-00004123
Contributor : Vasile Heresanu <>
Submitted on : Thursday, January 8, 2004 - 3:31:47 PM
Last modification on : Friday, December 18, 2020 - 1:22:02 PM
Long-term archiving on: : Friday, April 2, 2010 - 7:57:07 PM

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  • HAL Id : tel-00004123, version 1

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UJF | CNRS

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Vasile Heresanu. Electrodéposition sous champ magnétique de zinc et de fer.Propriétés magnétiques des arborescences de fer. Matière Condensée [cond-mat]. Université Joseph-Fourier - Grenoble I, 2003. Français. ⟨tel-00004123⟩

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