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Elaboration et propriétés de nanofils de CoPt et FePt électrodéposés

Yasmina Dahmane 1
1 MNM - Micro et NanoMagnétisme
NEEL - Institut Néel
Abstract : The main purpose of this work is to prepare CoPt and FePt nanowires by electrodeposition in nanoporous aluminum membranes. The electrochemical bath was composed of only two salts (chlorides), one for the cobalt (CoCl2, 6H2O) and one for platinum (K2PtCl6). We succeeded preparing networks of CoPt nanowires with diameters of about 70-80 nm and a coercivity of 1.1 Tesla at room temperature. These magnetically hard materials present the tetragonal phase L10 obtained after annealing at 700 °C the cubic phase of the deposited state.
We studied the structural and magnetic properties of samples prepared in the two types of membranes that we used: membranes done in the laboratory by anodisation of an aluminum layer and commercial membranes.
The magnetic measurements, carried out parallel and perpendicular to the axis of the wires, show a perfectly isotropic behavior. The quality of the two network types of pores does not seem to have an influence on the magnetic properties and in particular on the coercive field of the studied samples. The annealing parameters (temperature, time) are essential to obtain the most complete transformation from the deposited cubic phase into the tetragonal ordered L10 phase. The preparation of FePt nanowires was more complicated due to the ease of iron to form oxides. We have anyway succeeded preparing networks of FePt nanowires of 55~nm of diameter with a coercivity of 1.1 Tesla but inhomogeneous in composition.
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Contributor : Yasmina Dahmane <>
Submitted on : Thursday, March 8, 2007 - 3:11:53 PM
Last modification on : Friday, December 18, 2020 - 1:10:03 PM
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  • HAL Id : tel-00135694, version 1




Yasmina Dahmane. Elaboration et propriétés de nanofils de CoPt et FePt électrodéposés. Matière Condensée [cond-mat]. Université Joseph-Fourier - Grenoble I, 2007. Français. ⟨tel-00135694⟩



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